U.S. patent number 11,382,048 [Application Number 16/417,557] was granted by the patent office on 2022-07-05 for multiplexing solutions in dual connectivity.
This patent grant is currently assigned to QUALCOMM Incorporated. The grantee listed for this patent is QUALCOMM Incorporated. Invention is credited to Gene Fong, Peter Gaal, Alexei Yurievitch Gorokhov, Heechoon Lee, Timo Ville Vintola, Xiao Feng Wang.
United States Patent |
11,382,048 |
Gaal , et al. |
July 5, 2022 |
Multiplexing solutions in dual connectivity
Abstract
Methods, systems, and devices for wireless communications are
described. A user equipment (UE) may determine that uplink
communications are to be performed between the UE and a first cell
group associated with a first radio access technology (RAT) and
between the UE and a second cell group associated with a second
RAT. The UE may determine that the UE is configured for power
sharing for the uplink communications with the first cell group
associated with the first RAT and the second cell group associated
with the second RAT. The UE may calculate, based at least in part
on the power sharing and the uplink communications, a power
reduction factor for the uplink communications between the UE and
the second cell group. The UE may perform the uplink communications
with the first cell group and selectively perform the uplink
communications with the second cell group.
Inventors: |
Gaal; Peter (San Diego, CA),
Gorokhov; Alexei Yurievitch (San Diego, CA), Fong; Gene
(San Diego, CA), Vintola; Timo Ville (San Diego, CA),
Wang; Xiao Feng (San Diego, CA), Lee; Heechoon (San
Diego, CA) |
Applicant: |
Name |
City |
State |
Country |
Type |
QUALCOMM Incorporated |
San Diego |
CA |
US |
|
|
Assignee: |
QUALCOMM Incorporated (San
Diego, CA)
|
Family
ID: |
1000006410283 |
Appl.
No.: |
16/417,557 |
Filed: |
May 20, 2019 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20190364517 A1 |
Nov 28, 2019 |
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Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
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62684182 |
Jun 12, 2018 |
|
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62675155 |
May 22, 2018 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W
76/16 (20180201); H04W 52/346 (20130101); H04W
52/146 (20130101); H04W 88/06 (20130101) |
Current International
Class: |
H04W
84/12 (20090101); H04W 52/14 (20090101); H04W
76/16 (20180101); H04W 52/34 (20090101); H04W
88/06 (20090101) |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Other References
CATT: "Correction on Power Sharing for ENDC", 3GPP Draft;
R1-1800267 Powersharing ENDC, 3rd Generation Partnership Project
(3GPP), Mobile Competence Centre, 650, Route Des Lucioles, F-06921
Sophia-Antipolis Cedex, France vol. RAN WG1 No. Vancouver, Canada;
Jan. 22, 2018-Jan. 26, 2018 Jan. 13, 2018, XP051384745, Retrieved
from the Internet:
URL:http://www.3gpp.org/ftp/tsg%5Fran/WG1%5FRL1/TSGR1%5FAH/NR%5FAH%5F1801-
/Docs/ [retrieved on Jan. 13, 2018], 4 pages. cited by applicant
.
CATT: "Dynamic Power Sharing for NE-DC", 3GPP Draft; R1-1806302,
NE-DC_Power Sharing, 3rd Generation Partnership Project (3GPP),
Mobile Competence Centre, 650, Route Des Lucioles, F-06921
Sophia-Antipolis Cedex, France vol. RAN WG1 No. Busan, South Korea;
May 21, 2018-May 25, 2018 May 20, 2018, XP051441509, Retrieved from
the Internet:
URL:http://www.3gpp.org/ftp/Meetings%5F3GPP%5FSYNC/RAN1/Docs/
[retrieved on May 20, 2018], 4 pages. cited by applicant .
ERICSSON: "Configured output power for EN-DC", 3GPP Draft;
R4-1806725, 3rd Generation Partnership Project (3GPP), Mobile
Competence Centre, 650, Route Des Lucioles, F-06921
Sophia-Antipolis Cedex, France vol. TSG RAN, No. Busan. South
Korea; May 21, 2018-May 25, 2018, May 20, 2018, XP051446377,
Retrieved from the Internet:
URL:http://www.3gpp.org/ftp/Meetings%5F3GPP%5FSYNC/RAN4/Docs/
[retrieved on May 20, 2018], Sections 3.1 and 3.2, 6 pages. cited
by applicant .
Huawei et al., "Way Forward on LTE-NR Uplink Sharing from UE
Perspective", 3GPP Draft; RP-180502, 3rd Generation Partnership
Project (3GPP), Mobile Competence Centre, 650, Route Des Lucioles,
F-06921 Sophia-Antipolis Cedex, France vol. RAN WG4 No. Chennai,
India; Mar. 19, 2018-Mar. 22, 2018 Mar. 20, 2018, XP051411082,
Retrieved from the Internet:
URL:http://www.3gpp.org/ftp/Meetings%5F3GPP%5FSYNC/RAN/Docs/
[retrieved on Mar. 20, 2018], 3 pages. cited by applicant .
International Search Report and Written
Opinion--PCT/US2019/033257--ISA/EPO--dated Aug. 12, 2019. cited by
applicant.
|
Primary Examiner: Nguyen; Tu X
Attorney, Agent or Firm: Qualcomm Incorporated
Parent Case Text
CROSS REFERENCE
The present Application for Patent claims the benefit of U.S.
Provisional Patent Application No. 62/675,155 by GAAL, et al.,
entitled "MULTIPLEXING SOLUTIONS IN DUAL CONNECTIVITY," filed May
22, 2018; and claims the benefit of U.S. Provisional Patent
Application No. 62/684,182 by GAAL, et al., entitled "MULTIPLEXING
SOLUTIONS IN DUAL CONNECTIVITY," filed Jun. 12, 2018, each of which
is assigned to the assignee hereof and expressly incorporated
herein.
Claims
What is claimed is:
1. A method for wireless communication at a user equipment (UE),
comprising: determining that uplink communications are to be
performed between the UE and a first cell group associated with a
first radio access technology (RAT) and between the UE and a second
cell group associated with a second RAT; determining that the UE is
configured for power sharing for the uplink communications with the
first cell group associated with the first RAT and the second cell
group associated with the second RAT; identifying a power sharing
type of the UE between a first power sharing type configured to
perform power sharing asymmetrically for the first cell group and
the second cell group and a second power sharing type configured to
perform power sharing symmetrically for the first cell group and
the second cell group; calculating a power reduction factor for the
uplink communications between the UE and the second cell group,
wherein the calculating is based at least in part on the power
sharing, the power sharing type of the UE, and an overlap in time
between the uplink communications with the first cell group and the
uplink communications with the second cell group; and performing
the uplink communications with the first cell group and selectively
performing the uplink communications with the second cell group
based at least in part on the power reduction factor and a hop
boundary alignment between the uplink communications with the
second cell group and the uplink communications with the first cell
group.
2. The method of claim 1, further comprising: determining, based at
least in part on the power sharing type of the UE, that the UE is
configured to calculate a first transmit power for the uplink
communications of the first cell group and a second transmit power
for the uplink communications of the second cell group together
when calculating the power reduction factor; and calculating, based
at least in part on the power sharing type of the UE, an asymmetric
power reduction factor for the uplink communications with the first
cell group and with the second cell group.
3. The method of claim 1, further comprising: determining, based at
least in part on the power sharing type of the UE, that that the UE
is configured to calculate a first transmit power for the uplink
communications of the first cell group and a second transmit power
for the uplink communications of the second cell group
independently when calculating the power reduction factor; and
calculating, based at least in part on the power sharing type of
the UE, a symmetric power reduction factor for the uplink
communications with the first cell group and with the second cell
group.
4. The method of claim 1, wherein calculating the power reduction
factor comprises: calculating a first transmit power for the uplink
communications with the first cell group independent from a
calculation of a second transmit power for the uplink
communications with the second cell group; and calculating a third
transmit power for the uplink communications with the first cell
group in consideration of a calculation of a fourth transmit power
for the uplink communications with the second cell group.
5. The method of claim 4, further comprising: determining that a
transmit power difference between the first transmit power and the
third transmit power satisfies a threshold; and dropping, based at
least in part on the transmit power difference, from performing the
uplink communications with the second cell group.
6. The method of claim 4, further comprising: determining that a
transmit power difference between the second transmit power and the
fourth transmit power satisfies a threshold; and dropping, based at
least in part on the transmit power difference, the uplink
communications with the second cell group.
7. The method of claim 4, further comprising: determining that the
first transmit power calculated for the uplink communications with
the first cell group equals the third transmit power calculated for
the uplink communications with the first cell group; transmitting
the uplink communications with the first cell group using the third
transmit power based at least in part on determining that the first
transmit power equals the third transmit power; and transmitting
the uplink communications with the second cell group using the
fourth transmit power based at least in part on determining that
the first transmit power equals the third transmit power, wherein
performing the uplink communications is based at least in part on
transmitting the uplink communications with the first cell group
using the third transmit power and transmitting the uplink
communications with the second cell group using the fourth transmit
power.
8. The method of claim 4, further comprising: determining that the
first transmit power calculated for the uplink communications with
the first cell group is different than the third transmit power
calculated for the uplink communications with the first cell group;
and selecting a fifth transmit power for the uplink communications
with the second cell group based at least in part on determining
that the first transmit power is different than the third transmit
power, wherein the fifth transmit power is less than the fourth
transmit power, wherein performing the uplink communications is
based at least in part on selecting the fifth transmit power.
9. The method of claim 8, further comprising: selecting a sixth
transmit power for the uplink communications with the first cell
group based at least in part on selecting the fifth transmit power,
wherein the sixth transmit power is less than the first transmit
power and is greater than the third transmit power, wherein
performing the uplink communications is based at least in part on
selecting the sixth transmit power.
10. The method of claim 1, further comprising: determining that the
uplink communications with the first cell group at least partially
overlap in time with the uplink communications with the second cell
group, wherein the power reduction factor is based at least in part
on the overlap.
11. The method of claim 10, further comprising: determining, based
at least in part on the power reduction factor, that the uplink
communications with the first cell group comprise a reduced
transmit power transmission; and performing, based at least in part
on the reduced transmit power, one or both of reducing the transmit
power or dropping the uplink communications with the second cell
group.
12. The method of claim 10, further comprising: determining, based
at least in part on the power reduction factor, that the uplink
communications with the second cell group comprise a reduced
transmit power transmission; and performing, based at least in part
on the reduced transmit power, one or both of reducing the transmit
power or dropping the uplink communications with the second cell
group.
13. The method of claim 10, further comprising: determining that a
first frequency band of the uplink communications with the first
cell group at least partially overlap in frequency with a second
frequency band of the uplink communications with the second cell
group, wherein the power reduction factor is based at least in part
on the overlap.
14. The method of claim 1, further comprising: determining that the
second cell group uses a timeline that is compatible with the first
cell group, wherein calculating the power reduction factor is based
at least in part on determining that the second cell group uses the
timeline that is compatible with the first cell group.
15. The method of claim 1, wherein calculating the power reduction
factor comprises: determining whether a first communication
schedule for the uplink communications with the first cell group is
time aligned with respect to a second communication schedule for
the uplink communications with the second cell group, wherein
selectively performing the uplink communications with the second
cell group is based on the time alignment.
16. The method of claim 1, wherein calculating the power reduction
factor comprises: determining whether a first grant for the uplink
communications with the first cell group is received within a
defined time window with respect to a second grant for the uplink
communications with the second cell group, wherein selectively
performing the uplink communications with the second cell group is
based on the first and second grants being received within the time
window.
17. The method of claim 1, wherein calculating the power reduction
factor comprises: determining whether a first boundary for the
uplink communications with the first cell group is aligned with
respect to a second boundary for the uplink communications with the
second cell group, wherein selectively performing the uplink
communications with the second cell group is based on the
alignment.
18. The method of claim 1, wherein the first RAT comprises a long
term evolution (LTE) RAT and the second RAT comprises a new radio
(NR) RAT.
19. An apparatus for wireless communication at a user equipment
(UE), comprising: a processor; memory coupled to the processor; and
instructions stored in the memory and executable by the processor
to cause the apparatus to: determine that uplink communications are
to be performed between the UE and a first cell group associated
with a first radio access technology (RAT) and between the UE and a
second cell group associated with a second RAT; determine that the
UE is configured for power sharing for the uplink communications
with the first cell group associated with the first RAT and the
second cell group associated with the second RAT; identify a power
sharing type of the UE between a first power sharing type
configured to perform power sharing asymmetrically for the first
cell group and the second cell group and a second power sharing
type configured to perform power sharing symmetrically for the
first cell group and the second cell group; calculate a power
reduction factor for the uplink communications between the UE and
the second cell group, wherein the calculating is based at least in
part on the power sharing, the power sharing type of the UE, and an
overlap in time between the uplink communications with the first
cell group and the uplink communications with the second cell
group; and perform the uplink communications with the first cell
group and selectively perform the uplink communications with the
second cell group based at least in part on the power reduction
factor and a hop boundary alignment between the uplink
communications with the second cell group and the uplink
communications with the first cell group.
20. The apparatus of claim 19, wherein the instructions are further
executable by the processor to cause the apparatus to: determine,
based at least in part on power sharing type of the UE, that the UE
is configured to calculate a first transmit power for the uplink
communications of the first cell group and a second transmit power
for the uplink communications of the second cell group together
when calculating the power reduction factor; and calculate, based
at least in part on the power sharing type of the UE, an asymmetric
power reduction factor for the uplink communications with the first
cell group and with the second cell group.
21. The apparatus of claim 19, wherein the instructions are further
executable by the processor to cause the apparatus to: determine,
based at least in part on the power sharing type of the UE, that
that the UE is configured to calculate a first transmit power for
the uplink communications of the first cell group and a second
transmit power for the uplink communications of the second cell
group independently when calculating the power reduction factor;
and calculate, based at least in part on the power sharing type of
the UE, a symmetric power reduction factor for the uplink
communications with the first cell group and with the second cell
group.
22. The apparatus of claim 19, wherein the instructions to
calculate the power reduction factor are executable by the
processor to cause the apparatus to: calculate a first transmit
power for the uplink communications with the first cell group
independent from a calculation of a second transmit power for the
uplink communications with the second cell group; and calculate a
third transmit power for the uplink communications with the first
cell group in consideration of a calculation of a fourth transmit
power for the uplink communications with the second cell group.
23. The apparatus of claim 22, wherein the instructions are further
executable by the processor to cause the apparatus to: determine
that a transmit power difference between the first transmit power
and the third transmit power satisfies a threshold; and drop, based
at least in part on the transmit power difference, from performing
the uplink communications with the second cell group.
24. The apparatus of claim 22, wherein the instructions are further
executable by the processor to cause the apparatus to: determine
that a transmit power difference between the second transmit power
and the fourth transmit power satisfies a threshold; and drop,
based at least in part on the transmit power difference, the uplink
communications with the second cell group.
25. The apparatus of claim 22, wherein the instructions are further
executable by the processor to cause the apparatus to: determine
that the first transmit power calculated for the uplink
communications with the first cell group equals the third transmit
power calculated for the uplink communications with the first cell
group; transmit the uplink communications with the first cell group
using the third transmit power based at least in part on
determining that the first transmit power equals the third transmit
power; and transmit the uplink communications with the second cell
group using the fourth transmit power based at least in part on
determining that the first transmit power equals the third transmit
power, wherein performing the uplink communications is based at
least in part on transmitting the uplink communications with the
first cell group using the third transmit power and transmitting
the uplink communications with the second cell group using the
fourth transmit power.
26. The apparatus of claim 22, wherein the instructions are further
executable by the processor to cause the apparatus to: determine
that the first transmit power calculated for the uplink
communications with the first cell group is different than the
third transmit power calculated for the uplink communications with
the first cell group; and select a fifth transmit power for the
uplink communications with the second cell group based at least in
part on determining that the first transmit power is different than
the third transmit power, wherein the fifth transmit power is less
than the fourth transmit power, wherein performing the uplink
communications is based at least in part on selecting the fifth
transmit power.
27. The apparatus of claim 26, wherein the instructions are further
executable by the processor to cause the apparatus to: select a
sixth transmit power for the uplink communications with the first
cell group based at least in part on selecting the fifth transmit
power, wherein the sixth transmit power is less than the first
transmit power and is greater than the third transmit power,
wherein performing the uplink communications is based at least in
part on selecting the sixth transmit power.
28. The apparatus of claim 19, wherein the instructions are further
executable by the processor to cause the apparatus to: determine
that the uplink communications with the first cell group at least
partially overlap in time with the uplink communications with the
second cell group, wherein the power reduction factor is based at
least in part on the overlap.
29. The apparatus of claim 28, wherein the instructions are further
executable by the processor to cause the apparatus to: determine,
based at least in part on the power reduction factor, that the
uplink communications with the first cell group comprise a reduced
transmit power transmission; and perform, based at least in part on
the reduced transmit power, one or both of reducing the transmit
power or dropping the uplink communications with the second cell
group.
30. The apparatus of claim 28, wherein the instructions are further
executable by the processor to cause the apparatus to: determine,
based at least in part on the power reduction factor, that the
uplink communications with the second cell group comprise a reduced
transmit power transmission; and perform, based at least in part on
the reduced transmit power, one or both of reducing the transmit
power or dropping the uplink communications with the second cell
group.
31. The apparatus of claim 28, wherein the instructions are further
executable by the processor to cause the apparatus to: determine
that a first frequency band of the uplink communications with the
first cell group at least partially overlap in frequency with a
second frequency band of the uplink communications with the second
cell group, wherein the power reduction factor is based at least in
part on the overlap.
32. The apparatus of claim 19, wherein the instructions are further
executable by the processor to cause the apparatus to: determine
that the second cell group uses a timeline that is compatible with
the first cell group, wherein calculating the power reduction
factor is based at least in part on determining that the second
cell group uses the timeline that is compatible with the first cell
group.
33. The apparatus of claim 19, wherein the instructions to
calculate the power reduction factor are executable by the
processor to cause the apparatus to: determine whether a first
communication schedule for the uplink communications with the first
cell group is time aligned with respect to a second communication
schedule for the uplink communications with the second cell group,
wherein selectively performing the uplink communications with the
second cell group is based on the time alignment.
34. The apparatus of claim 19, wherein the instructions to
calculate the power reduction factor are executable by the
processor to cause the apparatus to: determine whether a first
grant for the uplink communications with the first cell group is
received within a defined time window with respect to a second
grant for the uplink communications with the second cell group,
wherein selectively performing the uplink communications with the
second cell group is based on the first and second grants being
received within the time window.
35. The apparatus of claim 19, wherein the instructions to
calculate the power reduction factor are executable by the
processor to cause the apparatus to: determine whether a first
boundary for the uplink communications with the first cell group is
aligned with respect to a second boundary for the uplink
communications with the second cell group, wherein selectively
performing the uplink communications with the second cell group is
based on the alignment.
36. The apparatus of claim 19, wherein the first RAT comprises a
long term evolution (LTE) RAT and the second RAT comprises a new
radio (NR) RAT.
37. An apparatus for wireless communication at a user equipment
(UE), comprising: means for determining that uplink communications
are to be performed between the UE and a first cell group
associated with a first radio access technology (RAT) and between
the UE and a second cell group associated with a second RAT; means
for determining that the UE is configured for power sharing for the
uplink communications with the first cell group associated with the
first RAT and the second cell group associated with the second RAT;
means for identifying a power sharing type of the UE between a
first power sharing type configured to perform power sharing
asymmetrically for the first cell group and the second cell group
and a second power sharing type configured to perform power sharing
symmetrically for the first cell group and the second cell group;
means for calculating a power reduction factor for the uplink
communications between the UE and the second cell group, wherein
the calculating is based at least in part on the power sharing, the
power sharing type of the UE, and and overlap in time between the
uplink communications with the first cell group and the uplink
communications with the second cell group; and means for performing
the uplink communications with the first cell group and selectively
performing the uplink communications with the second cell group
based at least in part on the power reduction factor and a hop
boundary alignment between the uplink communications with the
second cell group and the uplink communications with the first cell
group.
38. The apparatus of claim 37, further comprising: means for
determining, based at least in part on the power sharing type of
the UE, that the UE is configured to calculate a first transmit
power for the uplink communications of the first cell group and a
second transmit power for the uplink communications of the second
cell group together when calculating the power reduction factor;
and means for calculating, based at least in part on the power
sharing type of the UE, an asymmetric power reduction factor for
the uplink communications with the first cell group and with the
second cell group.
39. The apparatus of claim 37, further comprising: means for
determining, based at least in part on the power sharing type of
the UE, that that the UE is configured to calculate a first
transmit power for the uplink communications of the first cell
group and a second transmit power for the uplink communications of
the second cell group independently when calculating the power
reduction factor; and means for calculating, based at least in part
on the power sharing type of the UE, a symmetric power reduction
factor for the uplink communications with the first cell group and
with the second cell group.
40. The apparatus of claim 37, wherein the means for calculating
the power reduction factor comprises: means for calculating a first
transmit power for the uplink communications with the first cell
group independent from a calculation of a second transmit power for
the uplink communications with the second cell group; and means for
calculating a third transmit power for the uplink communications
with the first cell group in consideration of a calculation of a
fourth transmit power for the uplink communications with the second
cell group.
41. The apparatus of claim 40, further comprising: means for
determining that a transmit power difference between the first
transmit power and the third transmit power satisfies a threshold;
and means for dropping, based at least in part on the transmit
power difference, from performing the uplink communications with
the second cell group.
42. The apparatus of claim 40, further comprising: means for
determining that a transmit power difference between the second
transmit power and the fourth transmit power satisfies a threshold;
and means for dropping, based at least in part on the transmit
power difference, the uplink communications with the second cell
group.
43. The apparatus of claim 40, further comprising: means for
determining that the first transmit power calculated for the uplink
communications with the first cell group equals the third transmit
power calculated for the uplink communications with the first cell
group; means for transmitting the uplink communications with the
first cell group using the third transmit power based at least in
part on determining that the first transmit power equals the third
transmit power; and means for transmitting the uplink
communications with the second cell group using the fourth transmit
power based at least in part on determining that the first transmit
power equals the third transmit power, wherein performing the
uplink communications is based at least in part on transmitting the
uplink communications with the first cell group using the third
transmit power and transmitting the uplink communications with the
second cell group using the fourth transmit power.
44. The apparatus of claim 40, further comprising: means for
determining that the first transmit power calculated for the uplink
communications with the first cell group is different than the
third transmit power calculated for the uplink communications with
the first cell group; and means for selecting a fifth transmit
power for the uplink communications with the second cell group
based at least in part on determining that the first transmit power
is different than the third transmit power, wherein the fifth
transmit power is less than the fourth transmit power, wherein
performing the uplink communications is based at least in part on
selecting the fifth transmit power.
45. The apparatus of claim 44, further comprising: means for
selecting a sixth transmit power for the uplink communications with
the first cell group based at least in part on selecting the fifth
transmit power, wherein the sixth transmit power is less than the
first transmit power and is greater than the third transmit power,
wherein performing the uplink communications is based at least in
part on selecting the sixth transmit power.
46. The apparatus of claim 37, further comprising: means for
determining that the uplink communications with the first cell
group at least partially overlap in time with the uplink
communications with the second cell group, wherein the power
reduction factor is based at least in part on the overlap.
47. The apparatus of claim 46, further comprising: means for
determining, based at least in part on the power reduction factor,
that the uplink communications with the first cell group comprise a
reduced transmit power transmission; and means for performing,
based at least in part on the reduced transmit power, one or both
of reducing the transmit power or dropping the uplink
communications with the second cell group.
48. The apparatus of claim 46, further comprising: means for
determining, based at least in part on the power reduction factor,
that the uplink communications with the second cell group comprise
a reduced transmit power transmission; and means for performing,
based at least in part on the reduced transmit power, one or both
of reducing the transmit power or dropping the uplink
communications with the second cell group.
49. The apparatus of claim 46, further comprising: means for
determining that a first frequency band of the uplink
communications with the first cell group at least partially overlap
in frequency with a second frequency band of the uplink
communications with the second cell group, wherein the power
reduction factor is based at least in part on the overlap.
50. The apparatus of claim 37, further comprising: means for
determining that the second cell group uses a timeline that is
compatible with the first cell group, wherein calculating the power
reduction factor is based at least in part on determining that the
second cell group uses the timeline that is compatible with the
first cell group.
51. The apparatus of claim 37, wherein the means for calculating
the power reduction factor comprises: means for determining whether
a first communication schedule for the uplink communications with
the first cell group is time aligned with respect to a second
communication schedule for the uplink communications with the
second cell group, wherein selectively performing the uplink
communications with the second cell group is based on the time
alignment.
52. The apparatus of claim 37, wherein the means for calculating
the power reduction factor comprises: means for determining whether
a first grant for the uplink communications with the first cell
group is received within a defined time window with respect to a
second grant for the uplink communications with the second cell
group, wherein selectively performing the uplink communications
with the second cell group is based on the first and second grants
being received within the time window.
53. The apparatus of claim 37, wherein the means for calculating
the power reduction factor comprises: means for determining whether
a first boundary for the uplink communications with the first cell
group is aligned with respect to a second boundary for the uplink
communications with the second cell group, wherein selectively
performing the uplink communications with the second cell group is
based on the alignment.
54. The apparatus of claim 37, wherein the first RAT comprises a
long term evolution (LTE) RAT and the second RAT comprises a new
radio (NR) RAT.
55. A non-transitory computer-readable medium storing code for
wireless communication at a user equipment (UE), the code
comprising instructions executable by a processor to: determine
that uplink communications are to be performed between the UE and a
first cell group associated with a first radio access technology
(RAT) and between the UE and a second cell group associated with a
second RAT; determine that the UE is configured for power sharing
for the uplink communications with the first cell group associated
with the first RAT and the second cell group associated with the
second RAT; identify a power sharing type of the UE between a first
power sharing type configured to perform power sharing
asymmetrically for the first cell group and the second cell group
and a second power sharing type configured to perform power sharing
symmetrically for the first cell group and the second cell group;
calculate a power reduction factor for the uplink communications
between the UE and the second cell group, wherein the calculating
is based at least in part on the power sharing, the power sharing
type of the UE, and an overlap in time between the uplink
communications with the first cell group and the uplink
communications with the second cell group; and perform the uplink
communications with the first cell group and selectively perform
the uplink communications with the second cell group based at least
in part on the power reduction factor and a hop boundary alignment
between the uplink communications with the second cell group and
the uplink communications with the first cell group.
56. The non-transitory computer-readable medium of claim 55,
wherein the instructions are further executable to: determine,
based at least in part on the power sharing type of the UE, that
the UE is configured to calculate a first transmit power for the
uplink communications of the first cell group and a second transmit
power for the uplink communications of the second cell group
together when calculating the power reduction factor; and
calculate, based at least in part on the power sharing type of the
UE, an asymmetric power reduction factor for the uplink
communications with the first cell group and with the second cell
group.
57. The non-transitory computer-readable medium of claim 55,
wherein the instructions are further executable to: determine,
based at least in part on the power sharing type of the UE, that
that the UE is configured to calculate a first transmit power for
the uplink communications of the first cell group and a second
transmit power for the uplink communications of the second cell
group independently when calculating the power reduction factor;
and calculate, based at least in part on the power sharing type of
the UE, a symmetric power reduction factor for the uplink
communications with the first cell group and with the second cell
group.
58. The non-transitory computer-readable medium of claim 55,
wherein the instructions to calculate the power reduction factor
are executable to: calculate a first transmit power for the uplink
communications with the first cell group independent from a
calculation of a second transmit power for the uplink
communications with the second cell group; and calculate a third
transmit power for the uplink communications with the first cell
group in consideration of a calculation of a fourth transmit power
for the uplink communications with the second cell group.
59. The non-transitory computer-readable medium of claim 58,
wherein the instructions are further executable to: determine that
a transmit power difference between the first transmit power and
the third transmit power satisfies a threshold; and drop, based at
least in part on the transmit power difference, from performing the
uplink communications with the second cell group.
60. The non-transitory computer-readable medium of claim 58,
wherein the instructions are further executable to: determine that
a transmit power difference between the second transmit power and
the fourth transmit power satisfies a threshold; and drop, based at
least in part on the transmit power difference, the uplink
communications with the second cell group.
61. The non-transitory computer-readable medium of claim 58,
wherein the instructions are further executable to: determine that
the first transmit power calculated for the uplink communications
with the first cell group equals the third transmit power
calculated for the uplink communications with the first cell group;
transmit the uplink communications with the first cell group using
the third transmit power based at least in part on determining that
the first transmit power equals the third transmit power; and
transmit the uplink communications with the second cell group using
the fourth transmit power based at least in part on determining
that the first transmit power equals the third transmit power,
wherein performing the uplink communications is based at least in
part on transmitting the uplink communications with the first cell
group using the third transmit power and transmitting the uplink
communications with the second cell group using the fourth transmit
power.
62. The non-transitory computer-readable medium of claim 58,
wherein the instructions are further executable to: determine that
the first transmit power calculated for the uplink communications
with the first cell group is different than the third transmit
power calculated for the uplink communications with the first cell
group; and select a fifth transmit power for the uplink
communications with the second cell group based at least in part on
determining that the first transmit power is different than the
third transmit power, wherein the fifth transmit power is less than
the fourth transmit power, wherein performing the uplink
communications is based at least in part on selecting the fifth
transmit power.
63. The non-transitory computer-readable medium of claim 62,
wherein the instructions are further executable to: select a sixth
transmit power for the uplink communications with the first cell
group based at least in part on selecting the fifth transmit power,
wherein the sixth transmit power is less than the first transmit
power and is greater than the third transmit power, wherein
performing the uplink communications is based at least in part on
selecting the sixth transmit power.
64. The non-transitory computer-readable medium of claim 55,
wherein the instructions are further executable to: determine that
the uplink communications with the first cell group at least
partially overlap in time with the uplink communications with the
second cell group, wherein the power reduction factor is based at
least in part on the overlap.
65. The non-transitory computer-readable medium of claim 64,
wherein the instructions are further executable to: determine,
based at least in part on the power reduction factor, that the
uplink communications with the first cell group comprise a reduced
transmit power transmission; and perform, based at least in part on
the reduced transmit power, one or both of reducing the transmit
power or dropping the uplink communications with the second cell
group.
66. The non-transitory computer-readable medium of claim 64,
wherein the instructions are further executable to: determine,
based at least in part on the power reduction factor, that the
uplink communications with the second cell group comprise a reduced
transmit power transmission; and perform, based at least in part on
the reduced transmit power, one or both of reducing the transmit
power or dropping the uplink communications with the second cell
group.
67. The non-transitory computer-readable medium of claim 64,
wherein the instructions are further executable to: determine that
a first frequency band of the uplink communications with the first
cell group at least partially overlap in frequency with a second
frequency band of the uplink communications with the second cell
group, wherein the power reduction factor is based at least in part
on the overlap.
68. The non-transitory computer-readable medium of claim 55,
wherein the instructions are further executable to: determine that
the second cell group uses a timeline that is compatible with the
first cell group, wherein calculating the power reduction factor is
based at least in part on determining that the second cell group
uses the timeline that is compatible with the first cell group.
69. The non-transitory computer-readable medium of claim 55,
wherein the instructions to calculate the power reduction factor
are executable to: determine whether a first communication schedule
for the uplink communications with the first cell group is time
aligned with respect to a second communication schedule for the
uplink communications with the second cell group, wherein
selectively performing the uplink communications with the second
cell group is based on the time alignment.
70. The non-transitory computer-readable medium of claim 55,
wherein the instructions to calculate the power reduction factor
are executable to: determine whether a first grant for the uplink
communications with the first cell group is received within a
defined time window with respect to a second grant for the uplink
communications with the second cell group, wherein selectively
performing the uplink communications with the second cell group is
based on the first and second grants being received within the time
window.
71. The non-transitory computer-readable medium of claim 55,
wherein the instructions to calculate the power reduction factor
are executable to: determine whether a first boundary for the
uplink communications with the first cell group is aligned with
respect to a second boundary for the uplink communications with the
second cell group, wherein selectively performing the uplink
communications with the second cell group is based on the
alignment.
72. The non-transitory computer-readable medium of claim 55,
wherein the first RAT comprises a long term evolution (LTE) RAT and
the second RAT comprises a new radio (NR) RAT.
Description
BACKGROUND
The following relates generally to wireless communications and to
multiplexing solutions in dual connectivity.
Wireless communications systems are widely deployed to provide
various types of communication content such as voice, video, packet
data, messaging, broadcast, and so on. These systems may be capable
of supporting communication with multiple users by sharing the
available system resources (e.g., time, frequency, and power).
Examples of such multiple-access systems include fourth generation
(4G) systems such as Long Term Evolution (LTE) systems,
LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth
generation (5G) systems which may be referred to as New Radio (NR)
systems. These systems may employ technologies such as code
division multiple access (CDMA), time division multiple access
(TDMA), frequency division multiple access (FDMA), orthogonal
frequency division multiple access (OFDMA), or discrete Fourier
transform-spread-OFDM (DFT-S-OFDM). A wireless multiple-access
communications system may include a number of base stations or
network access nodes, each simultaneously supporting communication
for multiple communication devices, which may be otherwise known as
user equipment (UE).
SUMMARY
The described techniques relate to improved methods, systems,
devices, and apparatuses that support multiplexing solutions in
dual connectivity. Generally, the described techniques provide for
time division multiplexing (TDM) and/or frequency division
multiplexing (FDM) implementation in a dual connectivity (DC) mode,
such as an evolved universal terrestrial access network (E-UTRAN)
New Radio (NR) DC (EN-DC) scenario. Broadly, aspects of the
described techniques provide a mechanism for UE to perform power
sharing or reduction operations on one or both of a master cell
group (MCG) (e.g., a first cell group) and a secondary cell group
(SCG) (e.g., a second cell group) in a DC mode. For example, the UE
may be operating in a DC mode with connections to the MCG and the
SCG. In some aspects, the MCG may be associated with a long term
evolution (LTE) radio access technology (RAT) and the SCG may be
associated with an NR RAT. The UE may determine that the UE has
uplink communications to perform with the MCG in the SCG and that
the UE is configured for power sharing, e.g., including maximum
power reduction (MPR) and/or advanced MPR (A-MPR) operations. The
UE may calculate a power reduction factor for the uplink
communications between the UE and the SCG and/or for the uplink
communications between the UE and the MCG. In some aspects, based
on the power reduction factor, the UE may perform power reduction
for the uplink communications to the MCG and/or the SCG. In other
aspects, based on the power reduction factor, the UE may drop the
uplink communications with the SCG. Accordingly, the UE may perform
the uplink communications with the MCG and selectively perform the
uplink communications with the SCG.
A method of wireless communication at a UE is described. The method
may include determining that uplink communications are to be
performed between the UE and a first cell group associated with a
first RAT and between the UE and a second cell group associated
with a second RAT, determining that the UE is configured for power
sharing for the uplink communications with the first cell group
associated with the first RAT and the second cell group associated
with the second RAT, calculating, based on the power sharing and
the uplink communications, a power reduction factor for the uplink
communications between the UE and the second cell group, and
performing the uplink communications with the first cell group and
selectively performing, based on the power reduction factor, the
uplink communications with the second cell group.
An apparatus for wireless communication at a UE is described. The
apparatus may include a processor, memory coupled with the
processor, and instructions stored in the memory. The instructions
may be executable by the processor to cause the apparatus to
determine that uplink communications are to be performed between
the UE and a first cell group associated with a first RAT and
between the UE and a second cell group associated with a second
RAT, determine that the UE is configured for power sharing for the
uplink communications with the first cell group associated with the
first RAT and the second cell group associated with the second RAT,
calculate, based on the power sharing and the uplink
communications, a power reduction factor for the uplink
communications between the UE and the second cell group, and
perform the uplink communications with the first cell group and
selectively performing, based on the power reduction factor, the
uplink communications with the second cell group.
Another apparatus for wireless communication at a UE is described.
The apparatus may include means for determining that uplink
communications are to be performed between the UE and a first cell
group associated with a first RAT and between the UE and a second
cell group associated with a second RAT, determining that the UE is
configured for power sharing for the uplink communications with the
first cell group associated with the first RAT and the second cell
group associated with the second RAT, calculating, based on the
power sharing and the uplink communications, a power reduction
factor for the uplink communications between the UE and the second
cell group, and performing the uplink communications with the first
cell group and selectively performing, based on the power reduction
factor, the uplink communications with the second cell group.
A non-transitory computer-readable medium storing code for wireless
communication at a UE is described. The code may include
instructions executable by a processor to determine that uplink
communications are to be performed between the UE and a first cell
group associated with a first RAT and between the UE and a second
cell group associated with a second RAT, determine that the UE is
configured for power sharing for the uplink communications with the
first cell group associated with the first RAT and the second cell
group associated with the second RAT, calculate, based on the power
sharing and the uplink communications, a power reduction factor for
the uplink communications between the UE and the second cell group,
and perform the uplink communications with the first cell group and
selectively performing, based on the power reduction factor, the
uplink communications with the second cell group.
Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for determining that
the uplink communications with the first cell group at least
partially overlap in time with the uplink communications with the
second cell group, where the power reduction factor may be based on
the overlap.
Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for determining, based
on the power reduction factor, that the uplink communications with
the first cell group include a reduced transmit power transmission
and performing, based on the reduced transmit power, at least one
of reducing the transmit power or dropping the uplink
communications with the second cell group.
Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for determining, based
on the power reduction factor, that the uplink communications with
the second cell group include a reduced transmit power transmission
and performing, based on the reduced transmit power, at least one
of reducing the transmit power or dropping the uplink
communications with the second cell group.
Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for determining that a
first frequency band of the uplink communications with the first
cell group at least partially overlap in frequency with a second
frequency band of the uplink communications with the second cell
group, where the power reduction factor may be based on the
overlap.
Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for determining that
that the UE may be configured for a UE capability where a first
transmit power for the uplink communications of the first cell
group and a second transmit power for the uplink communications of
the second cell group may be considered together when calculating
the power reduction factor and calculating, based on the UE
capability, an asymmetric power reduction factor for the uplink
communications with the first cell group and with the second cell
group.
Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for determining that
that the UE may be configured for a UE capability where a first
transmit power for the uplink communications of the first cell
group and a second transmit power for the uplink communications of
the second cell group may be not considered together when
calculating the power reduction factor and calculating, based on
the UE capability, a symmetric power reduction factor for the
uplink communications with the first cell group and with the second
cell group.
In some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein, calculating the power
reduction factor may include operations, features, means, or
instructions for calculating a first transmit power for the uplink
communications with the first cell group independent from a
calculation of a second transmit power for the uplink
communications with the second cell group and calculating a third
transmit power for the uplink communications with the first cell
group in consideration of a calculation of a fourth transmit power
for the uplink communications with the second cell group.
Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for determining that a
transmit power difference between the first transmit power and the
third transmit power satisfies a threshold and dropping, based on
the transmit power difference, from performing the uplink
communications with the second cell group.
Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for determining that a
transmit power difference between the second transmit power and the
fourth transmit power satisfies a threshold and dropping, based on
the transmit power difference, the uplink communications with the
second cell group.
Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for determining that
the first transmit power calculated for the uplink communications
with the first cell group equals the third transmit power
calculated for the uplink communications with the first cell group,
transmitting the uplink communications with the first cell group
using the third transmit power based on determining that the first
transmit power equals the third transmit power and transmitting the
uplink communications with the second cell group using the fourth
transmit power based on determining that the first transmit power
equals the third transmit power, where performing the uplink
communications may be based on transmitting the uplink
communications with the first cell group using the third transmit
power and transmitting the uplink communications with the second
cell group using the fourth transmit power.
Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for determining that
the first transmit power calculated for the uplink communications
with the first cell group may be different than the third transmit
power calculated for the uplink communications with the first cell
group and selecting a fifth transmit power for the uplink
communications with the second cell group based on determining that
the first transmit power may be different than the third transmit
power, where the fifth transmit power may be less than the fourth
transmit power, where performing the uplink communications may be
based on selecting the fifth transmit power.
Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for selecting a sixth
transmit power for the uplink communications with the first cell
group based on selecting the fifth transmit power, where the sixth
transmit power may be less than the first transmit power and may be
greater than the third transmit power, where performing the uplink
communications may be based on selecting the sixth transmit
power.
Some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein may further include
operations, features, means, or instructions for determining that
the second cell group uses a timeline that may be compatible with
the first cell group, where calculating the power reduction factor
may be based on determining that the second cell group uses the
timeline that may be compatible with the first cell group.
In some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein, calculating the power
reduction factor may include operations, features, means, or
instructions for determining whether a first communication schedule
for the uplink communications with the first cell group may be time
aligned with respect to a second communication schedule for the
uplink communications with the second cell group, where selectively
performing the uplink communications with the second cell group may
be based on the time alignment.
In some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein, calculating the power
reduction factor may include operations, features, means, or
instructions for determining whether a first grant for the uplink
communications with the first cell group may be received within a
defined time window with respect to a second grant for the uplink
communications with the second cell group, where selectively
performing the uplink communications with the second cell group may
be based on the first and second grants being received within the
time window.
In some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein, calculating the power
reduction factor may include operations, features, means, or
instructions for determining whether a first boundary for the
uplink communications with the first cell group may be aligned with
respect to a second boundary for the uplink communications with the
second cell group, where selectively performing the uplink
communications with the second cell group may be based on the
alignment.
In some examples of the method, apparatuses, and non-transitory
computer-readable medium described herein, the first RAT includes
an LTE RAT and the second RAT includes an NR RAT.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates an example of a system for wireless
communications that supports multiplexing solutions in dual
connectivity in accordance with aspects of the present
disclosure.
FIG. 2 illustrates an example of a wireless communication system
that supports multiplexing solutions in dual connectivity in
accordance with aspects of the present disclosure.
FIG. 3 illustrates an example of a timeline that supports
multiplexing solutions in dual connectivity in accordance with
aspects of the present disclosure.
FIG. 4 illustrates an example of a process that supports
multiplexing solutions in dual connectivity in accordance with
aspects of the present disclosure.
FIGS. 5 and 6 show block diagrams of devices that support
multiplexing solutions in dual connectivity in accordance with
aspects of the present disclosure.
FIG. 7 shows a block diagram of a communications manager that
supports multiplexing solutions in dual connectivity in accordance
with aspects of the present disclosure.
FIG. 8 shows a diagram of a system including a device that supports
multiplexing solutions in dual connectivity in accordance with
aspects of the present disclosure.
FIGS. 9 through 11 show flowcharts illustrating methods that
support multiplexing solutions in dual connectivity in accordance
with aspects of the present disclosure.
DETAILED DESCRIPTION
Some wireless communications systems may be configured for dual
connectivity (DC), where the UE can communicate with an MCG and an
SCG
In some aspects, a user equipment (UE) may be configured for power
sharing operations when operating in a dual connectivity (DC) mode.
For example, the UE may be operating in the DC mode and perform
communications with a master cell group (MCG) and a secondary cell
group (SCG), with each cell group being associated with a different
radio access technology (RAT). For example, the MCG may be
associated with an LTE RAT, and the SCG may be associated with an
NR RAT. The UE may be configured to support power sharing, at least
to some degree, for the communications with the MCG and/or the
SCG.
Some communication scenarios may have associated power limitations,
e.g., certain configurations may be limited to a maximum power
headroom such that total transmission power is limited for the
combined transmissions to the MCG and the SCG, which may result in
inefficient power management. For example, conventional techniques
may not support the actual transmit power of one cell group being
considered in calculating the transmit power of the other cell
group. Moreover, conventional techniques may not support uplink
time division multiplexing (TDM) and/or frequency division
multiplexing (FDM) techniques in the context of DC that fully
support downlink resource utilization. Thus, conventional
techniques may not provide a mechanism where dynamic power sharing
is supported in multiple scenarios (e.g., for TDM and FDM) such
that the UE can dynamically adjust the transmit power for
multiplexed communications with the MCG and/or the SCG. As
described herein, in some cases, a UE may be configured to
dynamically manage the power associated with transmission to the
MCG and SCG. For example, a UE may be configured to calculate power
for the MCG and SCG uplink transmissions separately, under the
assumption that each RAT is operating independently. The UE may
also be configured to calculate the power for the MCG and SCG
uplink transmissions together (e.g., according to MPR and/or A-MPR
guidelines, which may specify an allowed amount of power decrease
associated with transmissions). In some cases, if the power
calculated for the MCG and SCG uplink transmission together differs
from either the power calculated for the MCG separately or the
power calculated for the SCG separately, the UE may reduce the
power associated with transmission to the SCG or drop (e.g.,
refrain from performing) the uplink transmission to the SCG.
Aspects of the disclosure are initially described in the context of
a wireless communications system. In some aspects, the UE may be
configured for communicating in a DC mode with an MCG (e.g., a
first cell group) and an SCG (e.g., a second cell group). The UE
may determine that the UE has uplink communications to perform
between the UE and the MCG and the UE and the SCG. In some aspects,
the MCG in the SCG may be associated with different RATs, e.g., the
MCG may be associated with an LTE RAT and the SCG may be associated
with an NR RAT. The UE may determine that it is configured for
power sharing for the uplink communications. Accordingly, the UE
may calculate a power reduction factor for uplink communications
between the UE and the SCG and/or between the UE and the MCG. Based
on the power reduction factor, the UE may perform the uplink
communications with the MCG and selectively perform uplink
communications with the SCG. In some aspects, selectively
performing the uplink communications with the SCG may include the
UE dropping the uplink communications with the SCG or the UE
adjusting the transmit power for the uplink communications with the
SCG. In some aspects, the UE may also adjust the transmit power for
the uplink communications with the MCG based on the power reduction
factor.
Aspects of the disclosure are further illustrated by and described
with reference to apparatus diagrams, system diagrams, and
flowcharts that relate to multiplexing solutions in dual
connectivity.
FIG. 1 illustrates an example of a wireless communications system
100 that supports multiplexing solutions in DC in accordance with
aspects of the present disclosure. The wireless communications
system 100 includes base stations 105, UEs 115, and a core network
130. In some examples, the wireless communications system 100 may
be an LTE network, an LTE-Advanced (LTE-A) network, an LTE-A Pro
network, or an NR network. In some cases, wireless communications
system 100 may support enhanced broadband communications,
ultra-reliable (e.g., mission critical) communications, low latency
communications, or communications with low-cost and low-complexity
devices.
Base stations 105 may wirelessly communicate with UEs 115 via one
or more base station antennas. Base stations 105 described herein
may include or may be referred to by those skilled in the art as a
base transceiver station, a radio base station, an access point, a
radio transceiver, a NodeB, an eNodeB (eNB), a next-generation Node
B or giga-nodeB (either of which may be referred to as a gNB), a
Home NodeB, a Home eNodeB, or some other suitable terminology.
Wireless communications system 100 may include base stations 105 of
different types (e.g., macro or small cell base stations). The UEs
115 described herein may be able to communicate with various types
of base stations 105 and network equipment including macro eNBs,
small cell eNBs, gNBs, relay base stations, and the like.
Each base station 105 may be associated with a particular
geographic coverage area 110 in which communications with various
UEs 115 is supported. Each base station 105 may provide
communication coverage for a respective geographic coverage area
110 via communication links 125, and communication links 125
between a base station 105 and a UE 115 may utilize one or more
carriers. Communication links 125 shown in wireless communications
system 100 may include uplink transmissions from a UE 115 to a base
station 105, or downlink transmissions from a base station 105 to a
UE 115. Downlink transmissions may also be called forward link
transmissions while uplink transmissions may also be called reverse
link transmissions.
The geographic coverage area 110 for a base station 105 may be
divided into sectors making up only a portion of the geographic
coverage area 110, and each sector may be associated with a cell.
For example, each base station 105 may provide communication
coverage for a macro cell, a small cell, a hot spot, or other types
of cells, or various combinations thereof. In some examples, a base
station 105 may be movable and therefore provide communication
coverage for a moving geographic coverage area 110. In some
examples, different geographic coverage areas 110 associated with
different technologies may overlap, and overlapping geographic
coverage areas 110 associated with different technologies may be
supported by the same base station 105 or by different base
stations 105. The wireless communications system 100 may include,
for example, a heterogeneous LTE/LTE-A/LTE-A Pro or NR network in
which different types of base stations 105 provide coverage for
various geographic coverage areas 110.
The term "cell" refers to a logical communication entity used for
communication with a base station 105 (e.g., over a carrier), and
may be associated with an identifier for distinguishing neighboring
cells (e.g., a physical cell identifier (PCID), a virtual cell
identifier (VCID)) operating via the same or a different carrier.
In some examples, a carrier may support multiple cells, and
different cells may be configured according to different protocol
types (e.g., machine-type communication (MTC), narrowband
Internet-of-Things (NB-IoT), enhanced mobile broadband (eMBB), or
others) that may provide access for different types of devices. In
some cases, the term "cell" may refer to a portion of a geographic
coverage area 110 (e.g., a sector) over which the logical entity
operates.
UEs 115 may be dispersed throughout the wireless communications
system 100, and each UE 115 may be stationary or mobile. A UE 115
may also be referred to as a mobile device, a wireless device, a
remote device, a handheld device, or a subscriber device, or some
other suitable terminology, where the "device" may also be referred
to as a unit, a station, a terminal, or a client. A UE 115 may also
be a personal electronic device such as a cellular phone, a
personal digital assistant (PDA), a tablet computer, a laptop
computer, or a personal computer. In some examples, a UE 115 may
also refer to a wireless local loop (WLL) station, an Internet of
Things (IoT) device, an Internet of Everything (IoE) device, or an
MTC device, or the like, which may be implemented in various
articles such as appliances, vehicles, meters, or the like.
Some UEs 115, such as MTC or IoT devices, may be low cost or low
complexity devices, and may provide for automated communication
between machines (e.g., via Machine-to-Machine (M2M)
communication). M2M communication or MTC may refer to data
communication technologies that allow devices to communicate with
one another or a base station 105 without human intervention. In
some examples, M2M communication or MTC may include communications
from devices that integrate sensors or meters to measure or capture
information and relay that information to a central server or
application program that can make use of the information or present
the information to humans interacting with the program or
application. Some UEs 115 may be designed to collect information or
enable automated behavior of machines. Examples of applications for
MTC devices include smart metering, inventory monitoring, water
level monitoring, equipment monitoring, healthcare monitoring,
wildlife monitoring, weather and geological event monitoring, fleet
management and tracking, remote security sensing, physical access
control, and transaction-based business charging.
Some UEs 115 may be configured to employ operating modes that
reduce power consumption, such as half-duplex communications (e.g.,
a mode that supports one-way communication via transmission or
reception, but not transmission and reception simultaneously). In
some examples half-duplex communications may be performed at a
reduced peak rate. Other power conservation techniques for UEs 115
include entering a power saving "deep sleep" mode when not engaging
in active communications, or operating over a limited bandwidth
(e.g., according to narrowband communications). In some cases, UEs
115 may be designed to support critical functions (e.g., mission
critical functions), and a wireless communications system 100 may
be configured to provide ultra-reliable communications for these
functions.
In some cases, a UE 115 may also be able to communicate directly
with other UEs 115 (e.g., using a peer-to-peer (P2P) or
device-to-device (D2D) protocol). One or more of a group of UEs 115
utilizing D2D communications may be within the geographic coverage
area 110 of a base station 105. Other UEs 115 in such a group may
be outside the geographic coverage area 110 of a base station 105,
or be otherwise unable to receive transmissions from a base station
105. In some cases, groups of UEs 115 communicating via D2D
communications may utilize a one-to-many (1:M) system in which each
UE 115 transmits to every other UE 115 in the group. In some cases,
a base station 105 facilitates the scheduling of resources for D2D
communications. In other cases, D2D communications are carried out
between UEs 115 without the involvement of a base station 105.
Base stations 105 may communicate with the core network 130 and
with one another. For example, base stations 105 may interface with
the core network 130 through backhaul links 132 (e.g., via an S1,
N2, N3, or another interface). Base stations 105 may communicate
with one another over backhaul links 134 (e.g., via an X2, Xn, or
other interface) either directly (e.g., directly between base
stations 105) or indirectly (e.g., via core network 130).
The core network 130 may provide user authentication, access
authorization, tracking, Internet Protocol (IP) connectivity, and
other access, routing, or mobility functions. The core network 130
may be an evolved packet core (EPC), which may include at least one
mobility management entity (MME), at least one serving gateway
(S-GW), and at least one Packet Data Network (PDN) gateway (P-GW).
The MME may manage non-access stratum (e.g., control plane)
functions such as mobility, authentication, and bearer management
for UEs 115 served by base stations 105 associated with the EPC.
User IP packets may be transferred through the S-GW, which itself
may be connected to the P-GW. The P-GW may provide IP address
allocation as well as other functions. The P-GW may be connected to
the network operators IP services. The operators IP services may
include access to the Internet, Intranet(s), an IP Multimedia
Subsystem (IMS), or a Packet-Switched (PS) Streaming Service.
At least some of the network devices, such as a base station 105,
may include subcomponents such as an access network entity, which
may be an example of an access node controller (ANC). Each access
network entity may communicate with UEs 115 through a number of
other access network transmission entities, which may be referred
to as a radio head, a smart radio head, or a transmission/reception
point (TRP). In some configurations, various functions of each
access network entity or base station 105 may be distributed across
various network devices (e.g., radio heads and access network
controllers) or consolidated into a single network device (e.g., a
base station 105).
Wireless communications system 100 may operate using one or more
frequency bands, typically in the range of 300 MHz to 300 GHz.
Generally, the region from 300 MHz to 3 GHz is known as the
ultra-high frequency (UHF) region or decimeter band, since the
wavelengths range from approximately one decimeter to one meter in
length. UHF waves may be blocked or redirected by buildings and
environmental features. However, the waves may penetrate structures
sufficiently for a macro cell to provide service to UEs 115 located
indoors. Transmission of UHF waves may be associated with smaller
antennas and shorter range (e.g., less than 100 km) compared to
transmission using the smaller frequencies and longer waves of the
high frequency (HF) or very high frequency (VHF) portion of the
spectrum below 300 MHz.
Wireless communications system 100 may also operate in a super high
frequency (SHF) region using frequency bands from 3 GHz to 30 GHz,
also known as the centimeter band. The SHF region includes bands
such as the 5 GHz industrial, scientific, and medical (ISM) bands,
which may be used opportunistically by devices that can tolerate
interference from other users.
Wireless communications system 100 may also operate in an extremely
high frequency (EHF) region of the spectrum (e.g., from 30 GHz to
300 GHz), also known as the millimeter band. In some examples,
wireless communications system 100 may support millimeter wave
(mmW) communications between UEs 115 and base stations 105, and EHF
antennas of the respective devices may be even smaller and more
closely spaced than UHF antennas. In some cases, this may
facilitate use of antenna arrays within a UE 115. However, the
propagation of EHF transmissions may be subject to even greater
atmospheric attenuation and shorter range than SHF or UHF
transmissions. Techniques disclosed herein may be employed across
transmissions that use one or more different frequency regions, and
designated use of bands across these frequency regions may differ
by country or regulating body.
In some cases, wireless communications system 100 may utilize both
licensed and unlicensed radio frequency spectrum bands. For
example, wireless communications system 100 may employ License
Assisted Access (LAA), LTE-Unlicensed (LTE-U) radio access
technology, or NR technology in an unlicensed band such as the 5
GHz ISM band. When operating in unlicensed radio frequency spectrum
bands, wireless devices such as base stations 105 and UEs 115 may
employ listen-before-talk (LBT) procedures to ensure a frequency
channel is clear before transmitting data. In some cases,
operations in unlicensed bands may be based on a CA configuration
in conjunction with CCs operating in a licensed band (e.g., LAA).
Operations in unlicensed spectrum may include downlink
transmissions, uplink transmissions, peer-to-peer transmissions, or
a combination of these. Duplexing in unlicensed spectrum may be
based on frequency division duplexing (FDD), time division
duplexing (TDD), or a combination of both.
In some examples, base station 105 or UE 115 may be equipped with
multiple antennas, which may be used to employ techniques such as
transmit diversity, receive diversity, multiple-input
multiple-output (MIMO) communications, or beamforming. For example,
wireless communications system 100 may use a transmission scheme
between a transmitting device (e.g., a base station 105) and a
receiving device (e.g., a UE 115), where the transmitting device is
equipped with multiple antennas and the receiving devices are
equipped with one or more antennas. MIMO communications may employ
multipath signal propagation to increase the spectral efficiency by
transmitting or receiving multiple signals via different spatial
layers, which may be referred to as spatial multiplexing. The
multiple signals may, for example, be transmitted by the
transmitting device via different antennas or different
combinations of antennas. Likewise, the multiple signals may be
received by the receiving device via different antennas or
different combinations of antennas. Each of the multiple signals
may be referred to as a separate spatial stream, and may carry bits
associated with the same data stream (e.g., the same codeword) or
different data streams. Different spatial layers may be associated
with different antenna ports used for channel measurement and
reporting. MIMO techniques include single-user MIMO (SU-MIMO) where
multiple spatial layers are transmitted to the same receiving
device, and multiple-user MIMO (MU-MIMO) where multiple spatial
layers are transmitted to multiple devices.
Beamforming, which may also be referred to as spatial filtering,
directional transmission, or directional reception, is a signal
processing technique that may be used at a transmitting device or a
receiving device (e.g., a base station 105 or a UE 115) to shape or
steer an antenna beam (e.g., a transmit beam or receive beam) along
a spatial path between the transmitting device and the receiving
device. Beamforming may be achieved by combining the signals
communicated via antenna elements of an antenna array such that
signals propagating at particular orientations with respect to an
antenna array experience constructive interference while others
experience destructive interference. The adjustment of signals
communicated via the antenna elements may include a transmitting
device or a receiving device applying certain amplitude and phase
offsets to signals carried via each of the antenna elements
associated with the device. The adjustments associated with each of
the antenna elements may be defined by a beamforming weight set
associated with a particular orientation (e.g., with respect to the
antenna array of the transmitting device or receiving device, or
with respect to some other orientation).
In one example, a base station 105 may use multiple antennas or
antenna arrays to conduct beamforming operations for directional
communications with a UE 115. For instance, some signals (e.g.
synchronization signals, reference signals, beam selection signals,
or other control signals) may be transmitted by a base station 105
multiple times in different directions, which may include a signal
being transmitted according to different beamforming weight sets
associated with different directions of transmission. Transmissions
in different beam directions may be used to identify (e.g., by the
base station 105 or a receiving device, such as a UE 115) a beam
direction for subsequent transmission and/or reception by the base
station 105. Some signals, such as data signals associated with a
particular receiving device, may be transmitted by a base station
105 in a single beam direction (e.g., a direction associated with
the receiving device, such as a UE 115). In some examples, the beam
direction associated with transmissions along a single beam
direction may be determined based at least in in part on a signal
that was transmitted in different beam directions. For example, a
UE 115 may receive one or more of the signals transmitted by the
base station 105 in different directions, and the UE 115 may report
to the base station 105 an indication of the signal it received
with a highest signal quality, or an otherwise acceptable signal
quality. Although these techniques are described with reference to
signals transmitted in one or more directions by a base station
105, a UE 115 may employ similar techniques for transmitting
signals multiple times in different directions (e.g., for
identifying a beam direction for subsequent transmission or
reception by the UE 115), or transmitting a signal in a single
direction (e.g., for transmitting data to a receiving device).
A receiving device (e.g., a UE 115, which may be an example of a
mmW receiving device) may try multiple receive beams when receiving
various signals from the base station 105, such as synchronization
signals, reference signals, beam selection signals, or other
control signals. For example, a receiving device may try multiple
receive directions by receiving via different antenna subarrays, by
processing received signals according to different antenna
subarrays, by receiving according to different receive beamforming
weight sets applied to signals received at a plurality of antenna
elements of an antenna array, or by processing received signals
according to different receive beamforming weight sets applied to
signals received at a plurality of antenna elements of an antenna
array, any of which may be referred to as "listening" according to
different receive beams or receive directions. In some examples a
receiving device may use a single receive beam to receive along a
single beam direction (e.g., when receiving a data signal). The
single receive beam may be aligned in a beam direction determined
based on listening according to different receive beam directions
(e.g., a beam direction determined to have a highest signal
strength, highest signal-to-noise ratio, or otherwise acceptable
signal quality based on listening according to multiple beam
directions).
In some cases, the antennas of a base station 105 or UE 115 may be
located within one or more antenna arrays, which may support MIMO
operations, or transmit or receive beamforming. For example, one or
more base station antennas or antenna arrays may be co-located at
an antenna assembly, such as an antenna tower. In some cases,
antennas or antenna arrays associated with a base station 105 may
be located in diverse geographic locations. A base station 105 may
have an antenna array with a number of rows and columns of antenna
ports that the base station 105 may use to support beamforming of
communications with a UE 115. Likewise, a UE 115 may have one or
more antenna arrays that may support various MIMO or beamforming
operations.
In some cases, wireless communications system 100 may be a
packet-based network that operate according to a layered protocol
stack. In the user plane, communications at the bearer or Packet
Data Convergence Protocol (PDCP) layer may be IP-based. A Radio
Link Control (RLC) layer may in some cases perform packet
segmentation and reassembly to communicate over logical channels. A
Medium Access Control (MAC) layer may perform priority handling and
multiplexing of logical channels into transport channels. The MAC
layer may also use hybrid automatic repeat request (HARQ) to
provide retransmission at the MAC layer to improve link efficiency.
In the control plane, the Radio Resource Control (RRC) protocol
layer may provide establishment, configuration, and maintenance of
an RRC connection between a UE 115 and a base station 105 or core
network 130 supporting radio bearers for user plane data. At the
Physical (PHY) layer, transport channels may be mapped to physical
channels.
In some cases, UEs 115 and base stations 105 may support
retransmissions of data to increase the likelihood that data is
received successfully. HARQ feedback is one technique of increasing
the likelihood that data is received correctly over a communication
link 125. HARQ may include a combination of error detection (e.g.,
using a cyclic redundancy check (CRC)), forward error correction
(FEC), and retransmission (e.g., automatic repeat request (ARQ)).
HARQ may improve throughput at the MAC layer in poor radio
conditions (e.g., signal-to-noise conditions). In some cases, a
wireless device may support same-slot HARQ feedback, where the
device may provide HARQ feedback in a specific slot for data
received in a previous symbol in the slot. In other cases, the
device may provide HARQ feedback in a subsequent slot, or according
to some other time interval.
Time intervals in LTE or NR may be expressed in multiples of a
basic time unit, which may, for example, refer to a sampling period
of T.sub.s=1/30,720,000 seconds. Time intervals of a communications
resource may be organized according to radio frames each having a
duration of 10 milliseconds (ms), where the frame period may be
expressed as T.sub.f=307,200 T.sub.s. The radio frames may be
identified by a system frame number (SFN) ranging from 0 to 1023.
Each frame may include 10 subframes numbered from 0 to 9, and each
subframe may have a duration of 1 ms. A subframe may be further
divided into 2 slots each having a duration of 0.5 ms, and each
slot may contain 6 or 7 modulation symbol periods (e.g., depending
on the length of the cyclic prefix prepended to each symbol
period). Excluding the cyclic prefix, each symbol period may
contain 2048 sampling periods. In some cases, a subframe may be the
smallest scheduling unit of the wireless communications system 100,
and may be referred to as a transmission time interval (TTI). In
other cases, a smallest scheduling unit of the wireless
communications system 100 may be shorter than a subframe or may be
dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) or
in selected component carriers using sTTIs).
In some wireless communications systems, a slot may further be
divided into multiple mini-slots containing one or more symbols. In
some instances, a symbol of a mini-slot or a mini-slot may be the
smallest unit of scheduling. Each symbol may vary in duration
depending on the subcarrier spacing or frequency band of operation,
for example. Further, some wireless communications systems may
implement slot aggregation in which multiple slots or mini-slots
are aggregated together and used for communication between a UE 115
and a base station 105.
The term "carrier" refers to a set of radio frequency spectrum
resources having a defined physical layer structure for supporting
communications over a communication link 125. For example, a
carrier of a communication link 125 may include a portion of a
radio frequency spectrum band that is operated according to
physical layer channels for a given radio access technology. Each
physical layer channel may carry user data, control information, or
other signaling. A carrier may be associated with a pre-defined
frequency channel (e.g., an E-UTRA absolute radio frequency channel
number (EARFCN)), and may be positioned according to a channel
raster for discovery by UEs 115. Carriers may be downlink or uplink
(e.g., in an FDD mode), or be configured to carry downlink and
uplink communications (e.g., in a TDD mode). In some examples,
signal waveforms transmitted over a carrier may be made up of
multiple sub-carriers (e.g., using multi-carrier modulation (MCM)
techniques such as OFDM or DFT-s-OFDM).
The organizational structure of the carriers may be different for
different radio access technologies (e.g., LTE, LTE-A, LTE-A Pro,
NR, etc.). For example, communications over a carrier may be
organized according to TTIs or slots, each of which may include
user data as well as control information or signaling to support
decoding the user data. A carrier may also include dedicated
acquisition signaling (e.g., synchronization signals or system
information, etc.) and control signaling that coordinates operation
for the carrier. In some examples (e.g., in a carrier aggregation
configuration), a carrier may also have acquisition signaling or
control signaling that coordinates operations for other
carriers.
Physical channels may be multiplexed on a carrier according to
various techniques. A physical control channel and a physical data
channel may be multiplexed on a downlink carrier, for example,
using time division multiplexing (TDM) techniques, frequency
division multiplexing (FDM) techniques, or hybrid TDM-FDM
techniques. In some examples, control information transmitted in a
physical control channel may be distributed between different
control regions in a cascaded manner (e.g., between a common
control region or common search space and one or more UE-specific
control regions or UE-specific search spaces).
A carrier may be associated with a particular bandwidth of the
radio frequency spectrum, and in some examples the carrier
bandwidth may be referred to as a "system bandwidth" of the carrier
or the wireless communications system 100. For example, the carrier
bandwidth may be one of a number of predetermined bandwidths for
carriers of a particular radio access technology (e.g., 1.4, 3, 5,
10, 15, 20, 40, or 80 MHz). In some examples, each served UE 115
may be configured for operating over portions or all of the carrier
bandwidth. In other examples, some UEs 115 may be configured for
operation using a narrowband protocol type that is associated with
a predefined portion or range (e.g., set of subcarriers or RBs)
within a carrier (e.g., "in-band" deployment of a narrowband
protocol type).
In a system employing MCM techniques, a resource element may
consist of one symbol period (e.g., a duration of one modulation
symbol) and one subcarrier, where the symbol period and subcarrier
spacing are inversely related. The number of bits carried by each
resource element may depend on the modulation scheme (e.g., the
order of the modulation scheme). Thus, the more resource elements
that a UE 115 receives and the higher the order of the modulation
scheme, the higher the data rate may be for the UE 115. In MIMO
systems, a wireless communications resource may refer to a
combination of a radio frequency spectrum resource, a time
resource, and a spatial resource (e.g., spatial layers), and the
use of multiple spatial layers may further increase the data rate
for communications with a UE 115.
Devices of the wireless communications system 100 (e.g., base
stations 105 or UEs 115) may have a hardware configuration that
supports communications over a particular carrier bandwidth, or may
be configurable to support communications over one of a set of
carrier bandwidths. In some examples, the wireless communications
system 100 may include base stations 105 and/or UEs 115 that can
support simultaneous communications via carriers associated with
more than one different carrier bandwidth.
Wireless communications system 100 may support communication with a
UE 115 on multiple cells or carriers, a feature which may be
referred to as carrier aggregation (CA) or multi-carrier operation.
A UE 115 may be configured with multiple downlink CCs and one or
more uplink CCs according to a carrier aggregation configuration.
Carrier aggregation may be used with both FDD and TDD component
carriers.
In some cases, wireless communications system 100 may utilize
enhanced component carriers (eCCs). An eCC may be characterized by
one or more features including wider carrier or frequency channel
bandwidth, shorter symbol duration, shorter TTI duration, or
modified control channel configuration. In some cases, an eCC may
be associated with a carrier aggregation configuration or a dual
connectivity configuration (e.g., when multiple serving cells have
a suboptimal or non-ideal backhaul link). An eCC may also be
configured for use in unlicensed spectrum or shared spectrum (e.g.,
where more than one operator is allowed to use the spectrum). An
eCC characterized by wide carrier bandwidth may include one or more
segments that may be utilized by UEs 115 that are not capable of
monitoring the whole carrier bandwidth or are otherwise configured
to use a limited carrier bandwidth (e.g., to conserve power).
In some cases, an eCC may utilize a different symbol duration than
other CCs, which may include use of a reduced symbol duration as
compared with symbol durations of the other CCs. A shorter symbol
duration may be associated with increased spacing between adjacent
subcarriers. A device, such as a UE 115 or base station 105,
utilizing eCCs may transmit wideband signals (e.g., according to
frequency channel or carrier bandwidths of 20, 40, 60, 80 MHz,
etc.) at reduced symbol durations (e.g., 16.67 microseconds). A TTI
in eCC may consist of one or multiple symbol periods. In some
cases, the TTI duration (that is, the number of symbol periods in a
TTI) may be variable.
Wireless communications systems such as an NR system may utilize
any combination of licensed, shared, and unlicensed spectrum bands,
among others. The flexibility of eCC symbol duration and subcarrier
spacing may allow for the use of eCC across multiple spectrums. In
some examples, NR shared spectrum may increase spectrum utilization
and spectral efficiency, specifically through dynamic vertical
(e.g., across the frequency domain) and horizontal (e.g., across
the time domain) sharing of resources.
A UE 115 may determine that uplink communications are to be
performed between the UE and a first cell group associated with a
first RAT and between the UE and a second cell group associated
with a second RAT. The UE 115 may determine that the UE is
configured for power sharing for the uplink communications with the
first cell group associated with the first RAT and the second cell
group associated with the second RAT. The UE 115 may calculate,
based on the power sharing and the uplink communications, a power
reduction factor for the uplink communications between the UE and
the second cell group. The UE 115 may perform the uplink
communications with the first cell group and selectively
performing, based on the power reduction factor, the uplink
communications with the second cell group.
FIG. 2 illustrates an example of a wireless communications system
200 that supports multiplexing solutions in DC in accordance with
aspects of the present disclosure. In some examples, wireless
communications system 200 may implement aspects of wireless
communications system 100. Wireless communications system 200 may
include a base station 105-a, a base station 105-b, and a UE 115-a,
which may be examples of base stations 105 and UEs 115 as described
herein. Base station 105-a may be associated with a SCG and may be
referred to as SCG 105-a. Base station 105-b may be associated with
an MCG and may be referred to as MCG 105-b. Accordingly, UE 115-a
may be configured to operate in DC to communicate with SCG 105-a
and MCG 105-b (e.g., simultaneously, serially, using TDM or FDM,
etc.) using aspects of the described power sharing techniques. In
some cases, UE 115-a may be initially configured to communicate
with SCG 105-a on a secondary serving cell on a secondary carrier
205 and to communicate with MCG 105-b on a master serving cell on a
primary carrier 210.
In some cases, MCG 105-b may be associated with a first RAT (e.g.,
an LTE RAT) and the SCG 105-a may be associated with a second RAT
(e.g., an NR RAT). In some aspects, each RAT may have an associated
set of protocols configured to support power sharing when operating
in a DC mode. In some aspects, the corresponding set of protocols
in conventional wireless communication systems may not be
configured to support each other. Thus, aspects of wireless
communications system 200 may provide an efficient mechanism for DC
operations with different RATs.
In some aspects, wireless communications system 200 may support
aspects of power sharing operations. For example, in some aspects
MCG 105-b and SCG 105-a may have limited coordination on the
network side (e.g., Type II) where a semi-static TDM pattern is
supported. In other examples, MCG 105-b and SCG 105-a may have more
complex coordination on the network side (e.g., Type I) where
dynamic coordination is supported and can be adjusted based on
traffic needs.
As described herein, UE 115-a may identify or otherwise determine
that uplink communications are to be performed between UE 115-a and
MCG 105-b and between UE 115-a and SCG 105-a. In some aspects, this
may include UE 115-a receiving a grant from MCG 105-b and a grant
from SCG 105-a, respectively. In some aspects, the grants may carry
or otherwise provide an indication of resources to use for the
corresponding uplink communications. For example, each grant may
have an indication of frequency resources and/or time resources to
be used for the corresponding uplink communications.
In some aspects, UE 115-a may determine that it is configured for
power sharing for the uplink communications. In some aspects, this
may include UE 115-a calculating a power reduction factor for the
uplink communications between UE 115-a and MCG 105-b and/or between
UE 115-a and SCG 105-a. For example, UE 115-a may determine that it
is a Type 1 UE that supports dynamic sharing capability in a DC
mode or that it is a Type II UE that has a more limited dynamic
sharing capability. For example, a Type I UE may be configured such
that transmit power for uplink communications for both the MCG
105-b and the SCG 105-a are known and considered together when
performing power sharing and reduction operations, e.g., when
performing maximum power reductions (MPR), advanced MPR (A-MPR)
operations, and the like. As another example, a Type II UE may be
configured such that the transmit power for uplink communications
for both MCG 105-b and SCG 105-a are not known or otherwise
considered together when performing power sharing and reduction
operations. In other examples, UE 115-a may know, but may not
consider, the transmit power for uplink communications for both MCG
105-b and SCG 105-a. In some aspects, this may include UE 115
performing asymmetric MPR/A-MPR for Type I UEs and performing
symmetric MPR/A-MPR for Type II UEs.
In some aspects, the described techniques may allow wide discretion
for UE 115-a to drop uplink communications between UE 115-a and SCG
105-a. For example, UE 115-a may calculate the power (e.g., a
transmit power) for uplink communications between UE 115-a and MCG
105-b and calculate the power for uplink communications between UE
115-a and SCG 105-a separately, e.g., may consider the transmit
powers independently for the respective uplink communications. UE
115-a may then calculate the power for uplink communications
between UE 115-a and MCG 105-b and calculate the power for uplink
communications between UE 115-a and SCG 105-a together, e.g., may
consider the transmit powers together for the uplink
communications. In some aspects, UE 115-a may determine if the
power calculated separately and the power calculated together are
within a defined range of each other. If the calculated transmit
powers are within the defined range, UE 115-a may perform the power
reduction operations for the uplink communications with MCG 105-b
and with SCG 105-a. If the calculated transmit powers are not
within the defined range, UE 115-a may drop the uplink
communications with SCG 105-a and/or reduce the transmit power for
the uplink communications with SCG 105-a.
In some aspects, UE 115-a may be configured to `slow down` uplink
communications between the UE 115-a and SCG 105-a. For example, UE
115-a may perform the power sharing operations discussed herein and
also determine whether a timeline (e.g., communication schedule)
for the uplink communications with SCG 105-a are compatible with
the timeline for the uplink communications with MCG 105-b. If the
timeline for the uplink communications with SCG 105-a and MCG 105-b
are compatible, UE 115-a may perform the uplink communications with
MCG 105-b and SCG 105-a. If the timelines for the uplink
communications with SCG 105-a and MCG 105-b are not compatible, UE
115-a may drop the uplink communications with SCG 105-a.
In some aspects, UE 115-a may not perform power sharing operations
for uplink communications with MCG 105-b. For example, UE 115-a may
determine whether the grant for the uplink communications with MCG
105-b is received within a defined time window with respect to a
grant for the uplink communications with SCG 105-a. In some
aspects, UE 115-a may not consider any grant received for uplink
communications with SCG 105-a that is received outside of the
defined time window when performing power sharing operations.
Accordingly, UE 115-a may not update power headroom (PHR) for
uplink communications with MCG 105-b, e.g., may disregard the
uplink communications with the SCG 105-a for PHR computation for
the MCG 105-b.
In some aspects, UE 115-a may determine whether there is symbol
alignment for the uplink communications with MCG 105-b and SCG
105-a. For example, when the uplink communications with MCG 105-b
and SCG 105-a share a similar transmit chain/power amplifier, UE
115-a may determine whether the boundaries for the uplink
communications with MCG 105-b and SCG 105-a are aligned.
Accordingly, UE 115-a may be configured to ensure that the stop and
start time and hop boundaries for the uplink communications with
MCG 105-b and SCG 105-a are aligned. When the boundaries are not
aligned, UE 115-a may drop the uplink communications with SCG
105-a, e.g., to avoid phase coherence issues.
In some aspects, UE 115-a may perform the uplink communications
with MCG 105-b according to the described power sharing and
reduction techniques. A UE 115-a may selectively perform the uplink
communications with SCG 105-a, based on, for example, the power
reduction factor, communication schedule, boundary alignment, and
the like. In some aspects, when one or more conflicts arise with
respect to uplink communications with SCG 105-a, UE 115-a may drop
the uplink with SCG 105-a to protect the uplink communications with
MCG 105-b.
FIG. 3 illustrates an example of a timeline 300 that supports
multiplexing solutions in dual connectivity in accordance with
aspects of the present disclosure. In some examples, timeline 300
may implement aspects of wireless communication systems 100, 200.
Aspects of timeline 300 may be implemented by a UE and/or base
station, which may be examples of the corresponding devices
described herein.
At time T0, the UE may receive a grant from a first cell group
(e.g., an MCG) that carries or otherwise provides an indication of
resources to use for uplink communications with the MCG.
At time T1, the UE may receive a grant from a second cell group
(e.g., an SCG) that carries or otherwise provides an indication of
resources to use for uplink communications with the SCG. In some
aspects, each grant may carry or otherwise provide an indication of
the time and/or frequency resources to use for the corresponding
uplink communications.
At time T2, the UE may calculate the transmit power for the uplink
communications with the MCG. In some aspects, this may include the
UE calculating or otherwise determining the transmit power for the
uplink communications with the MCG assuming that there are no
uplink communications scheduled with the SCG. In some aspects,
power sharing operations (e.g., MPR/A-MPR) for the uplink
communications may depend on the component carriers for the uplink
communications with the MCG. Accordingly, the UE may determine the
transmit power (e.g., based on the power headroom) for the uplink
communications with the MCG assuming there are no uplink
communications scheduled with a SCG.
At time T3, the UE may calculate or otherwise determine the
transmit power for the uplink communications with the SCG. In some
aspects, this may include the UE calculating the transmit power for
the uplink communications to the SCG considering the transmit power
for the uplink communications with the MCG. For example, the UE may
determine the transmit power for the uplink communications with the
MCG together with the transmit power for the uplink communications
with the SCG. Based on this determination, the UE may determine
whether to transmit or not transmit the uplink communications
(e.g., selectively perform the uplink communications) with the SCG.
When the UE determines to perform the uplink communications with
the SCG, the UE may determine or otherwise calculate the gain for
the uplink communications with the SCG and/or recalculate (e.g.,
re-scale) the transmit power for the uplink communications with the
MCG.
In some aspects, if the UE determines that the transmit power for
the uplink communications with the MCG will drop (e.g., will be
lowered by some amount, or beyond a threshold value) in response to
the transmit power for the uplink communications with the SCG, the
UE may determine whether to drop the uplink communications with the
SCG. In some aspects, the UE may determine whether the power
headroom for the uplink communications with the MCG would change in
response to the uplink communications with the SCG, and determine
whether to transmit or drop the uplink communications with the SCG
accordingly. In some aspects, the UE may determine whether the
transmit power for the uplink communications with the SCG is
changed in response to the transmit power for the uplink
communications with the MCG, and determine whether to transmit or
drop the uplink communications to the SCG.
At time T4, the UE may perform the uplink communications with the
MCG (e.g., LTE RAT) and selectively perform the communications with
the SCG (e.g., NR RAT, based on the UE capability). In some
aspects, the uplink communications with the SCG may include a gap
period 305, physical uplink shared channel (PUSCH) 310, a gap
period 315, and PUSCH 320. In some aspects, the uplink
communications with the MCG may include PUSCH 325, a gap period
330, and a sounding reference signal (SRS) 335.
In some aspects, the UE may determine whether to keep or drop
(e.g., whether to perform or refrain from performing) the uplink
communications with the SCG based on various timing parameters. For
example, if the uplink communications with the SCG and the uplink
communications with the MCG are not symbol aligned, the UE may
determine to drop the uplink communications with the SCG. Moreover,
if the timeline (e.g., communication schedule) for the uplink
communications with the MCG in the SCG are not compatible, the UE
may determine to drop the uplink communications with the SCG.
In some aspects, the UE may determine to drop the uplink
communications with the SCG in order to avoid phase coherence
issues (illustrated by the curved lines in PUSCH 325 and PUSCH
320). For example, if the UE begins transmitting PUSCH 310 while
PUSCH 325 is ongoing, this may introduce phase coherence issues
(e.g., a phase shift) for PUSCH 325. Similarly, if the UE begins
transmitting SRS 335 while PUSCH 320 is ongoing, this may also
introduce phase coherence issues for PUSCH 320. Accordingly, the UE
may determine whether to perform the transmission or drop the
transmission of the uplink communications with the SCG when the
timing parameters are not compatible or would otherwise introduce
phase coherence issues.
FIG. 4 illustrates an example of a process 400 that supports
multiplexing solutions in dual connectivity in accordance with
aspects of the present disclosure. In some examples, process 400
may implement aspects of wireless communication systems 100/200
and/or timeline 300. Process 400 may include an MCG 405, a UE 410,
and an SCG 415, which may be examples of the corresponding devices
described herein. In some aspects, MCG 405 and/or SCG 415 may be
examples of a base station. In some aspects, MCG 405 and SCG 415
may be associated with different RATs. In some aspects, MCG 405 may
be referred to as a first cell group and SCG 415 may be referred to
as a second cell group.
At 420, UE 410 may determine that uplink communications are to be
performed between the UE and MCG 405 that is associated with a
first RAT (e.g., LTE RAT) and SCG 415 that is associated with a
second RAT (e.g., NR RAT). In some aspects, this may include UE 410
receiving a grant from MCG 405 and SCG 415 that carries or
otherwise provides an indication of resources for the uplink
communications.
At 425, UE 410 may determine that it is configured for power
sharing for the uplink communications with the MCG 405 and the SCG
415. For example, UE 410 may be configured for different UE
capabilities (e.g., Type 1 UE or Type II UE, a power sharing
configuration, and the like). In some aspects, this may include UE
410 adjusting transmit powers for the uplink communications with
the MCG 405 and/or SCG 415.
At 430, UE 410 may calculate, based on the power sharing in the
uplink communications, a power reduction factor for the uplink
communications between the UE 410 and the MCG 405 and/or the SCG
415.
In some aspects, this may include UE 410 determining that the
uplink communications with MCG 405 overlap in time (at least to
some degree) with the uplink communications with SCG 415. UE 410
may calculate the power reduction factor based on this overlap. For
example, UE 410 may determine that the uplink communications with
the MCG 405 include a reduced transmit power (e.g., based on the
power reduction factor performed during the power sharing
operations). UE 410 may determine whether to reduce the transmit
power or drop the uplink communications with the SCG 415 based on
the reduced transmit power for the uplink communications with MCG
405. As another example, UE 410 may determine that the uplink
communications with SCG 415 include a reduced transmit power
transmission. UE 410 may determine whether to reduce the transmit
power or drop the uplink communications with SCG 415 based on the
reduced transmit power for the uplink communications with SCG 415.
As another example, UE 410 may determine that a first frequency
band of the uplink communications with MCG 405 overlap (at least to
some degree) in frequency with the frequency band of the uplink
communications with SCG 415. UE 410 may calculate the power
reduction factor based on this overlap.
In some aspects, this may include UE 410 considering both transmit
powers for the uplink communications with MCG 405 and SCG 415 when
calculating the power reduction factor. In some aspects, this may
include UE 410 calculating an asymmetric power reduction factor for
the uplink communications with MCG 405 and SCG 415, e.g., UE 410
calculating different power reduction factors for the uplink
communications with MCG 405 and SCG 415.
In some aspects, this may include UE 410 not considering the
transmit powers together with the uplink communications with MCG
405 and SCG 415 when calculating the power reduction factor. In
this example, UE 410 may calculate asymmetric power reduction
factor for the uplink communications with MCG 405 and SCG 415.
In some aspects, this may include UE 410 calculating a first
transmit power for the uplink communications with MCG 405 and
calculating of a second transmit power for uplink communications
with SCG 415. UE 410 may then calculate the third transmit power
for the uplink communications with MCG 405 considering together
with a calculation of a fourth transmit power for uplink
communications with SCG 415. UE 410 may determine that a transmit
power difference between the first transmit power and the third
transmit power satisfies a threshold and drop uplink communications
with the SCG 415 based on the determination. UE 410 may determine
that the transmit power difference between the second transmit
power and the fourth transmit power satisfy a threshold and drop
the uplink communications with the SCG 415 based on the
determination.
In some aspects, the UE 410 may calculate a power reduction factor
for the uplink communications between the UE 410 and the MCG 405
and/or the SCG 415 according to a first power procedure. The first
power procedure may include a variety of operations. In a first
operation, the UE 410 may calculate a first transmit power for the
uplink communications with the MCG 405 (e.g., P_MCG_only) without
considering the transmit power for the uplink communications with
the SCG 415. In a second operation, the UE 410 may calculate a
second transmit power for the uplink communications with the SCG
415 (e.g., P_SCG_only) without considering the transmit power for
the uplink communications with the MCG 405. In a third operation,
the UE 410 may calculate a third transmit power for the uplink
communications with the MCG 405 (e.g., P_MCG) and a fourth transmit
power for the uplink communications with the SCG 415 (e.g., P_SCG)
according to a dynamic power sharing rule.
In a fourth operation, the UE 410 may determine the actual transmit
powers for the uplink communications with the MCG 405 and the
uplink communications with the SCG 415 based on variety of
considerations. For example, if the transmit powers calculated in
the first operation and the second operation differ from the
transmit powers calculated in the third operation for either uplink
communications with the MCG 405 or the uplink communications with
the SCG 415, the UE 410 may scale down or drop the transmit power
of the uplink communications with the SCG 415. In some examples, if
P_MCG_only equals P_MCG and P_SCG_only equals P_SCG (e.g.,
P_MCG)_only==P_MCG && P_SCG_only==P_SCG), the UE 410 may
transmit the uplink communications with the MCG 405 at P_MCG and
the uplink communications with the SCG 415 at P_SCG. If this
condition is not met, the UE 410 may select a new transmit power
for the uplink communications with the SCG 415 (e.g., P_SCG'),
where the new transmit power is less than P_SCG and greater than or
equal to zero (e.g., 0<=P_SCG'<P_SCG). The new transmit
power, P_SCG' for the uplink communications with the SCG 415 may
represent a transmit power that is scaled down or dropped relative
to P_SCG. The UE 410 may select a new transmit power for uplink
communications with the MCG 405 (e.g., P_MCG') based on P_SCG'. In
some examples, if P_SCG' equal zero, P_MCG' may be P_MCG_only. In
some examples, if P_SCG' is equal to P_SCG, P_MCG' may be equal to
P_MCG. In some examples, if P_SCG' is greater than zero but less
than P_SCG, P_MCG' may be equal to some value between P_MCG and
P_MCG_only (e.g., P_MCG<P_MCG'<P_MCG_only). In such examples,
the UE 410 may determine the P_MCG' based on the P_SCG', such that
the total transmit power does not exceed a threshold.
After performing the first power procedure, the UE 410 may transmit
the uplink communications with the MCG 405 using a transmit power
of P_MCG' and may transmit the uplink communications with the SCG
415 using a transmit power of P_SCG'. P_MCG' and P_SCG' may be
determined based on the operations described above. The operations
described above illustrate possible implementations of the first
power procedure, and the operations and the steps may be rearranged
or otherwise modified. Further, aspects from two or more of the
procedures or operations may be combined.
In some aspects, the UE 410 may calculate a power reduction factor
for the uplink communications between the UE 410 and the MCG 405
and/or the SCG 415 according to a second power procedure. The
second power procedure may provide conditional power control
operation based on one or more timeline requirements being
satisfied. The second power procedure may be initiated if the UE
410 is a type 1 configured with intra-band EN-DC and the uplink
communications with the MCG 405 overlap in time with the uplink
communications with the SCG 415. The second power control procedure
may be performed before the first power control procedure in some
cases. These power procedures (both the first and second) may
initiated based on the SCG 415 running on a timeline that is
compatible with the MCG 405. For example, in cases where the MCG
405 is LTE and the SCG 415 is NR, and if the k1, k2 of the SCG 415
may be greater than or equal to 4 ms, the UE 410 may initiate these
power procedures.
The UE 410 may determine whether the uplink communications with the
SCG 415 are grant-based (e.g., PUSCH, A-CSI, A-SRS) and the grant
triggering the uplink communications with the SCG 415 meets the
timeline for the MCG 405. For FDD, to meet these conditions, the
grant for the uplink communications with the SCG 415 may be no
later than the first three symbols of the SCG slot starting a
duration (e.g., 4 ms) before the start of the MCG subframe
containing the uplink communications with the MCG 405. For TDD, to
meet these conditions, the grant for the uplink communications with
the SCG 415 may be no later than the associated MCG downlink
control in the MCG TDD HARQ timeline.
The UE 410 may also determine whether certain communications meet
the MCG HARQ timeline. For example, the UE 410 may determine
whether the uplink communications with the SCG 415 that includes
HARQ-ACK, the latest physical downlink shared channel (PDSCH) for
the SCG 415 to which the HARQ-ACK corresponds, and/or the SCG
downlink control associated with that PDSCH meet the MCG HARQ
timeline. For FDD, to meet these conditions, the PDSCH for the SCG
415 may end no later than a duration (e.g., 3 ms) before the start
of the MCG uplink subframe. For TDD, to meet these conditions, the
PDSCH for the SCG 415 ends no later than the PDSCH for the MCG 405
in the MCG TDD HARQ timeline. In some cases, for either FDD and/or
TDD, similar conditions may be met for the downlink control of the
SCG 415 that grants the PDSCH for the SCG 415.
If the UE 410 determines that some or all of these described
conditions are met, the UE 410 may perform one or more normal power
control operations. For example, the UE 410 may initiate power
control operations indicated in RAN1 and/or RAN4 definitions. In
some cases, when some or all of these conditions are not met, the
UE 410 may initiate the first power procedure described above.
At 435, UE 410 may perform uplink communications with the MCG 405,
e.g., based on the power reduction factor. At 440, UE 410 may
selectively perform uplink communications with SCG 415, e.g., based
on the power reduction factor. In some aspects, this may include UE
410 either performing the transmissions of the uplink
communications to SCG 415 or dropping the transmission of the
uplink communications to SCG 415.
FIG. 5 shows a block diagram 500 of a device 505 that supports
multiplexing solutions in dual connectivity in accordance with
aspects of the present disclosure. The device 505 may be an example
of aspects of a UE 115 as described herein. The device 505 may
include a receiver 510, a communications manager 515, and a
transmitter 520. The device 505 may also include a processor. Each
of these components may be in communication with one another (e.g.,
via one or more buses).
The receiver 510 may receive information such as packets, user
data, or control information associated with various information
channels (e.g., control channels, data channels, and information
related to multiplexing solutions in dual connectivity, etc.).
Information may be passed on to other components of the device 505.
The receiver 510 may be an example of aspects of the transceiver
820 described with reference to FIG. 8. The receiver 510 may
utilize a single antenna or a set of antennas.
The communications manager 515 may determine that uplink
communications are to be performed between the UE and a first cell
group associated with a first RAT and between the UE and a second
cell group associated with a second RAT, determine that the UE is
configured for power sharing for the uplink communications with the
first cell group associated with the first RAT and the second cell
group associated with the second RAT, calculate, based on the power
sharing and the uplink communications, a power reduction factor for
the uplink communications between the UE and the second cell group,
and perform the uplink communications with the first cell group and
selectively performing, based on the power reduction factor, the
uplink communications with the second cell group. The
communications manager 515 may be an example of aspects of the
communications manager 810 described herein.
The communications manager 515, or its sub-components, may be
implemented in hardware, code (e.g., software or firmware) executed
by a processor, or any combination thereof. If implemented in code
executed by a processor, the functions of the communications
manager 515, or its sub-components may be executed by a
general-purpose processor, a DSP, an application-specific
integrated circuit (ASIC), a FPGA or other programmable logic
device, discrete gate or transistor logic, discrete hardware
components, or any combination thereof designed to perform the
functions described in the present disclosure.
The communications manager 515, or its sub-components, may be
physically located at various positions, including being
distributed such that portions of functions are implemented at
different physical locations by one or more physical components. In
some examples, the communications manager 515, or its
sub-components, may be a separate and distinct component in
accordance with various aspects of the present disclosure. In some
examples, the communications manager 515, or its sub-components,
may be combined with one or more other hardware components,
including but not limited to an input/output (I/O) component, a
transceiver, a network server, another computing device, one or
more other components described in the present disclosure, or a
combination thereof in accordance with various aspects of the
present disclosure.
The transmitter 520 may transmit signals generated by other
components of the device 505. In some examples, the transmitter 520
may be collocated with a receiver 510 in a transceiver module. For
example, the transmitter 520 may be an example of aspects of the
transceiver 820 described with reference to FIG. 8. The transmitter
520 may utilize a single antenna or a set of antennas.
FIG. 6 shows a block diagram 600 of a device 605 that supports
multiplexing solutions in dual connectivity in accordance with
aspects of the present disclosure. The device 605 may be an example
of aspects of a device 505 or a UE 115 as described herein. The
device 605 may include a receiver 610, a communications manager
615, and a transmitter 640. The device 605 may also include a
processor. Each of these components may be in communication with
one another (e.g., via one or more buses).
The receiver 610 may receive information such as packets, user
data, or control information associated with various information
channels (e.g., control channels, data channels, and information
related to multiplexing solutions in dual connectivity, etc.).
Information may be passed on to other components of the device 605.
The receiver 610 may be an example of aspects of the transceiver
820 described with reference to FIG. 8. The receiver 610 may
utilize a single antenna or a set of antennas.
The communications manager 615 may be an example of aspects of the
communications manager 515 as described herein. The communications
manager 615 may include a dual connectivity manager 620, a power
sharing manager 625, a power reduction factor manager 630, and an
uplink communication manager 635. The communications manager 615
may be an example of aspects of the communications manager 810
described herein.
The dual connectivity manager 620 may determine that uplink
communications are to be performed between the UE and a first cell
group associated with a first RAT and between the UE and a second
cell group associated with a second RAT.
The power sharing manager 625 may determine that the UE is
configured for power sharing for the uplink communications with the
first cell group associated with the first RAT and the second cell
group associated with the second RAT.
The power reduction factor manager 630 may calculate, based on the
power sharing and the uplink communications, a power reduction
factor for the uplink communications between the UE and the second
cell group.
The uplink communication manager 635 may perform the uplink
communications with the first cell group and selectively
performing, based on the power reduction factor, the uplink
communications with the second cell group.
The transmitter 640 may transmit signals generated by other
components of the device 605. In some examples, the transmitter 640
may be collocated with a receiver 610 in a transceiver module. For
example, the transmitter 640 may be an example of aspects of the
transceiver 820 described with reference to FIG. 8. The transmitter
640 may utilize a single antenna or a set of antennas.
FIG. 7 shows a block diagram 700 of a communications manager 705
that supports multiplexing solutions in dual connectivity in
accordance with aspects of the present disclosure. The
communications manager 705 may be an example of aspects of a
communications manager 515, a communications manager 615, or a
communications manager 810 described herein. The communications
manager 705 may include a dual connectivity manager 710, a power
sharing manager 715, a power reduction factor manager 720, an
uplink communication manager 725, a dual connectivity communication
manager 730, a power sharing configuration manager 735, and an UE
type manager 740. Each of these modules may communicate, directly
or indirectly, with one another (e.g., via one or more buses).
The dual connectivity manager 710 may determine that uplink
communications are to be performed between the UE and a first cell
group associated with a first RAT and between the UE and a second
cell group associated with a second RAT.
In some cases, the first RAT includes a long term evolution (LTE)
RAT and the second RAT includes a new radio (NR) RAT.
The power sharing manager 715 may determine that the UE is
configured for power sharing for the uplink communications with the
first cell group associated with the first RAT and the second cell
group associated with the second RAT.
The power reduction factor manager 720 may calculate, based on the
power sharing and the uplink communications, a power reduction
factor for the uplink communications between the UE and the second
cell group.
In some examples, the power reduction factor manager 720 may
determine whether a first communication schedule for the uplink
communications with the first cell group is time aligned with
respect to a second communication schedule for the uplink
communications with the second cell group, where selectively
performing the uplink communications with the second cell group is
based on the time alignment.
In some examples, the power reduction factor manager 720 may
determine whether a first grant for the uplink communications with
the first cell group is received within a defined time window with
respect to a second grant for the uplink communications with the
second cell group, where selectively performing the uplink
communications with the second cell group is based on the first and
second grants being received within the time window.
In some examples, the power reduction factor manager 720 may
determine whether a first boundary for the uplink communications
with the first cell group is aligned with respect to a second
boundary for the uplink communications with the second cell group,
where selectively performing the uplink communications with the
second cell group is based on the alignment.
The power reduction factor manager 720 may determine that the first
transmit power calculated for the uplink communications with the
first cell group equals the third transmit power calculated for the
uplink communications with the first cell group. In some examples,
the power reduction factor manager 720 may transmit the uplink
communications with the first cell group using the third transmit
power based on determining that the first transmit power equals the
third transmit power.
In some examples, the power reduction factor manager 720 may
transmit the uplink communications with the second cell group using
the fourth transmit power based on determining that the first
transmit power equals the third transmit power, where performing
the uplink communications is based on transmitting the uplink
communications with the first cell group using the third transmit
power and transmitting the uplink communications with the second
cell group using the fourth transmit power.
In some examples, the power reduction factor manager 720 may
determine that the first transmit power calculated for the uplink
communications with the first cell group is different than the
third transmit power calculated for the uplink communications with
the first cell group. In some examples, the power reduction factor
manager 720 may select a fifth transmit power for the uplink
communications with the second cell group based on determining that
the first transmit power is different than the third transmit
power, where the fifth transmit power is less than the fourth
transmit power, where performing the uplink communications is based
on selecting the fifth transmit power.
In some examples, the power reduction factor manager 720 may select
a sixth transmit power for the uplink communications with the first
cell group based on selecting the fifth transmit power, where the
sixth transmit power is less than the first transmit power and is
greater than the third transmit power, where performing the uplink
communications is based on selecting the sixth transmit power.
In some examples, the power reduction factor manager 720 may
determine that the second cell group uses a timeline that is
compatible with the first cell group, where calculating the power
reduction factor is based on determining that the second cell group
uses the timeline that is compatible with the first cell group.
The uplink communication manager 725 may perform the uplink
communications with the first cell group and selectively
performing, based on the power reduction factor, the uplink
communications with the second cell group.
The dual connectivity communication manager 730 may determine that
the uplink communications with the first cell group at least
partially overlap in time with the uplink communications with the
second cell group, where the power reduction factor is based on the
overlap.
In some examples, the dual connectivity communication manager 730
may determine, based on the power reduction factor, that the uplink
communications with the first cell group include a reduced transmit
power transmission.
In some examples, the dual connectivity communication manager 730
may perform, based on the reduced transmit power, at least one of
reducing the transmit power or dropping the uplink communications
with the second cell group.
In some examples, the dual connectivity communication manager 730
may determine, based on the power reduction factor, that the uplink
communications with the second cell group include a reduced
transmit power transmission.
In some examples, the dual connectivity communication manager 730
may determine that a first frequency band of the uplink
communications with the first cell group at least partially overlap
in frequency with a second frequency band of the uplink
communications with the second cell group, where the power
reduction factor is based on the overlap.
The power sharing configuration manager 735 may determine that that
the UE is configured for a UE capability where a first transmit
power for the uplink communications of the first cell group and a
second transmit power for the uplink communications of the second
cell group are considered together when calculating the power
reduction factor.
In some examples, the power sharing configuration manager 735 may
calculate, based on the UE capability, an asymmetric power
reduction factor for the uplink communications with the first cell
group and with the second cell group.
In some examples, the power sharing configuration manager 735 may
determine that that the UE is configured for a UE capability where
a first transmit power for the uplink communications of the first
cell group and a second transmit power for the uplink
communications of the second cell group are not considered together
when calculating the power reduction factor.
In some examples, the power sharing configuration manager 735 may
calculate, based on the UE capability, a symmetric power reduction
factor for the uplink communications with the first cell group and
with the second cell group.
The UE type manager 740 may calculate a first transmit power for
the uplink communications with the first cell group independent
from a calculation of a second transmit power for the uplink
communications with the second cell group.
In some examples, the UE type manager 740 may calculate a third
transmit power for the uplink communications with the first cell
group in consideration of a calculation of a fourth transmit power
for the uplink communications with the second cell group.
In some examples, the UE type manager 740 may determine that a
transmit power difference between the first transmit power and the
third transmit power satisfies a threshold.
In some examples, the UE type manager 740 may drop, based on the
transmit power difference, from performing the uplink
communications with the second cell group.
In some examples, the UE type manager 740 may determine that a
transmit power difference between the second transmit power and the
fourth transmit power satisfies a threshold.
In some examples, the UE type manager 740 may drop, based on the
transmit power difference, the uplink communications with the
second cell group.
FIG. 8 shows a diagram of a system 800 including a device 805 that
supports multiplexing solutions in dual connectivity in accordance
with aspects of the present disclosure. The device 805 may be an
example of or include the components of device 505, device 605, or
a UE 115 as described herein. The device 805 may include components
for bi-directional voice and data communications including
components for transmitting and receiving communications, including
a communications manager 810, an I/O controller 815, a transceiver
820, an antenna 825, memory 830, and a processor 840. These
components may be in electronic communication via one or more buses
(e.g., bus 845).
The communications manager 810 may determine that uplink
communications are to be performed between the UE and a first cell
group associated with a first RAT and between the UE and a second
cell group associated with a second RAT, determine that the UE is
configured for power sharing for the uplink communications with the
first cell group associated with the first RAT and the second cell
group associated with the second RAT, calculate, based on the power
sharing and the uplink communications, a power reduction factor for
the uplink communications between the UE and the second cell group,
and perform the uplink communications with the first cell group and
selectively performing, based on the power reduction factor, the
uplink communications with the second cell group.
The I/O controller 815 may manage input and output signals for the
device 805. The I/O controller 815 may also manage peripherals not
integrated into the device 805. In some cases, the I/O controller
815 may represent a physical connection or port to an external
peripheral. In some cases, the I/O controller 815 may utilize an
operating system such as iOS.RTM., ANDROID.RTM., MS-DOS.RTM.,
MS-WINDOWS.RTM., OS/2.RTM., UNIX.RTM., LINUX.RTM., or another known
operating system. In other cases, the I/O controller 815 may
represent or interact with a modem, a keyboard, a mouse, a
touchscreen, or a similar device. In some cases, the I/O controller
815 may be implemented as part of a processor. In some cases, a
user may interact with the device 805 via the I/O controller 815 or
via hardware components controlled by the I/O controller 815.
The transceiver 820 may communicate bi-directionally, via one or
more antennas, wired, or wireless links as described above. For
example, the transceiver 820 may represent a wireless transceiver
and may communicate bi-directionally with another wireless
transceiver. The transceiver 820 may also include a modem to
modulate the packets and provide the modulated packets to the
antennas for transmission, and to demodulate packets received from
the antennas.
In some cases, the wireless device may include a single antenna
825. However, in some cases the device may have more than one
antenna 825, which may be capable of concurrently transmitting or
receiving multiple wireless transmissions.
The memory 830 may include random access memory (RAM) and read only
memory (ROM). The memory 830 may store computer-readable,
computer-executable code 835 including instructions that, when
executed, cause the processor to perform various functions
described herein. In some cases, the memory 830 may contain, among
other things, a BIOS which may control basic hardware or software
operation such as the interaction with peripheral components or
devices.
The processor 840 may include an intelligent hardware device,
(e.g., a general-purpose processor, a DSP, a CPU, a
microcontroller, an ASIC, an FPGA, a programmable logic device, a
discrete gate or transistor logic component, a discrete hardware
component, or any combination thereof). In some cases, the
processor 840 may be configured to operate a memory array using a
memory controller. In other cases, a memory controller may be
integrated into the processor 840. The processor 840 may be
configured to execute computer-readable instructions stored in a
memory (e.g., the memory 830) to cause the device 805 to perform
various functions (e.g., functions or tasks supporting multiplexing
solutions in dual connectivity).
The code 835 may include instructions to implement aspects of the
present disclosure, including instructions to support wireless
communications. The code 835 may be stored in a non-transitory
computer-readable medium such as system memory or other type of
memory. In some cases, the code 835 may not be directly executable
by the processor 840 but may cause a computer (e.g., when compiled
and executed) to perform functions described herein.
FIG. 9 shows a flowchart illustrating a method 900 that supports
multiplexing solutions in dual connectivity in accordance with
aspects of the present disclosure. The operations of method 900 may
be implemented by a UE 115 or its components as described herein.
For example, the operations of method 900 may be performed by a
communications manager as described with reference to FIGS. 5
through 8. In some examples, a UE may execute a set of instructions
to control the functional elements of the UE to perform the
functions described below. Additionally or alternatively, a UE may
perform aspects of the functions described below using
special-purpose hardware.
At 905, the UE may determine that uplink communications are to be
performed between the UE and a first cell group associated with a
first RAT and between the UE and a second cell group associated
with a second RAT. The operations of 905 may be performed according
to the methods described herein. In some examples, aspects of the
operations of 905 may be performed by a dual connectivity manager
as described with reference to FIGS. 5 through 8.
At 910, the UE may determine that the UE is configured for power
sharing for the uplink communications with the first cell group
associated with the first RAT and the second cell group associated
with the second RAT. The operations of 910 may be performed
according to the methods described herein. In some examples,
aspects of the operations of 910 may be performed by a power
sharing manager as described with reference to FIGS. 5 through
8.
At 915, the UE may calculate, based on the power sharing and the
uplink communications, a power reduction factor for the uplink
communications between the UE and the second cell group. The
operations of 915 may be performed according to the methods
described herein. In some examples, aspects of the operations of
915 may be performed by a power reduction factor manager as
described with reference to FIGS. 5 through 8.
At 920, the UE may perform the uplink communications with the first
cell group and selectively performing, based on the power reduction
factor, the uplink communications with the second cell group. The
operations of 920 may be performed according to the methods
described herein. In some examples, aspects of the operations of
920 may be performed by an uplink communication manager as
described with reference to FIGS. 5 through 8.
FIG. 10 shows a flowchart illustrating a method 1000 that supports
multiplexing solutions in dual connectivity in accordance with
aspects of the present disclosure. The operations of method 1000
may be implemented by a UE 115 or its components as described
herein. For example, the operations of method 1000 may be performed
by a communications manager as described with reference to FIGS. 5
through 8. In some examples, a UE may execute a set of instructions
to control the functional elements of the UE to perform the
functions described below. Additionally or alternatively, a UE may
perform aspects of the functions described below using
special-purpose hardware.
At 1005, the UE may determine that uplink communications are to be
performed between the UE and a first cell group associated with a
first RAT and between the UE and a second cell group associated
with a second RAT. The operations of 1005 may be performed
according to the methods described herein. In some examples,
aspects of the operations of 1005 may be performed by a dual
connectivity manager as described with reference to FIGS. 5 through
8.
At 1010, the UE may determine that the UE is configured for power
sharing for the uplink communications with the first cell group
associated with the first RAT and the second cell group associated
with the second RAT. The operations of 1010 may be performed
according to the methods described herein. In some examples,
aspects of the operations of 1010 may be performed by a power
sharing manager as described with reference to FIGS. 5 through
8.
At 1015, the UE may calculate, based on the power sharing and the
uplink communications, a power reduction factor for the uplink
communications between the UE and the second cell group. The
operations of 1015 may be performed according to the methods
described herein. In some examples, aspects of the operations of
1015 may be performed by a power reduction factor manager as
described with reference to FIGS. 5 through 8.
At 1020, the UE may perform the uplink communications with the
first cell group and selectively performing, based on the power
reduction factor, the uplink communications with the second cell
group. The operations of 1020 may be performed according to the
methods described herein. In some examples, aspects of the
operations of 1020 may be performed by an uplink communication
manager as described with reference to FIGS. 5 through 8.
At 1025, the UE may determine that the uplink communications with
the first cell group at least partially overlap in time with the
uplink communications with the second cell group, where the power
reduction factor is based on the overlap. The operations of 1025
may be performed according to the methods described herein. In some
examples, aspects of the operations of 1025 may be performed by a
dual connectivity communication manager as described with reference
to FIGS. 5 through 8.
FIG. 11 shows a flowchart illustrating a method 1100 that supports
multiplexing solutions in dual connectivity in accordance with
aspects of the present disclosure. The operations of method 1100
may be implemented by a UE 115 or its components as described
herein. For example, the operations of method 1100 may be performed
by a communications manager as described with reference to FIGS. 5
through 8. In some examples, a UE may execute a set of instructions
to control the functional elements of the UE to perform the
functions described below. Additionally or alternatively, a UE may
perform aspects of the functions described below using
special-purpose hardware.
At 1105, the UE may determine that uplink communications are to be
performed between the UE and a first cell group associated with a
first RAT and between the UE and a second cell group associated
with a second RAT. The operations of 1105 may be performed
according to the methods described herein. In some examples,
aspects of the operations of 1105 may be performed by a dual
connectivity manager as described with reference to FIGS. 5 through
8.
At 1110, the UE may determine that the UE is configured for power
sharing for the uplink communications with the first cell group
associated with the first RAT and the second cell group associated
with the second RAT. The operations of 1110 may be performed
according to the methods described herein. In some examples,
aspects of the operations of 1110 may be performed by a power
sharing manager as described with reference to FIGS. 5 through
8.
At 1115, the UE may calculate, based on the power sharing and the
uplink communications, a power reduction factor for the uplink
communications between the UE and the second cell group. The
operations of 1115 may be performed according to the methods
described herein. In some examples, aspects of the operations of
1115 may be performed by a power reduction factor manager as
described with reference to FIGS. 5 through 8.
At 1120, the UE may perform the uplink communications with the
first cell group and selectively performing, based on the power
reduction factor, the uplink communications with the second cell
group. The operations of 1120 may be performed according to the
methods described herein. In some examples, aspects of the
operations of 1120 may be performed by an uplink communication
manager as described with reference to FIGS. 5 through 8.
At 1125, the UE may determine that that the UE is configured for a
UE capability where a first transmit power for the uplink
communications of the first cell group and a second transmit power
for the uplink communications of the second cell group are not
considered together when calculating the power reduction factor.
The operations of 1125 may be performed according to the methods
described herein. In some examples, aspects of the operations of
1125 may be performed by a power sharing configuration manager as
described with reference to FIGS. 5 through 8.
At 1130, the UE may calculate, based on the UE capability, a
symmetric power reduction factor for the uplink communications with
the first cell group and with the second cell group. The operations
of 1130 may be performed according to the methods described herein.
In some examples, aspects of the operations of 1130 may be
performed by a power sharing configuration manager as described
with reference to FIGS. 5 through 8.
It should be noted that the methods described above describe
possible implementations, and that the operations and the steps may
be rearranged or otherwise modified and that other implementations
are possible. Further, aspects from two or more of the methods may
be combined.
Techniques described herein may be used for various wireless
communications systems such as code division multiple access
(CDMA), time division multiple access (TDMA), frequency division
multiple access (FDMA), orthogonal frequency division multiple
access (OFDMA), single carrier frequency division multiple access
(SC-FDMA), and other systems. A CDMA system may implement a radio
technology such as CDMA2000, Universal Terrestrial Radio Access
(UTRA), etc. CDMA2000 covers IS-2000, IS-95, and IS-856 standards.
IS-2000 Releases may be commonly referred to as CDMA2000 1.times.,
1.times., etc. IS-856 (TIA-856) is commonly referred to as CDMA2000
1.times.EV-DO, High Rate Packet Data (HRPD), etc. UTRA includes
Wideband CDMA (WCDMA) and other variants of CDMA. A TDMA system may
implement a radio technology such as Global System for Mobile
Communications (GSM).
An OFDMA system may implement a radio technology such as Ultra
Mobile Broadband (UMB), Evolved UTRA (E-UTRA), Institute of
Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE
802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are
part of Universal Mobile Telecommunications System (UMTS). LTE,
LTE-A, and LTE-A Pro are releases of UMTS that use E-UTRA. UTRA,
E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR, and GSM are described in
documents from the organization named "3rd Generation Partnership
Project" (3GPP). CDMA2000 and UMB are described in documents from
an organization named "3rd Generation Partnership Project 2"
(3GPP2). The techniques described herein may be used for the
systems and radio technologies mentioned above as well as other
systems and radio technologies. While aspects of an LTE, LTE-A,
LTE-A Pro, or NR system may be described for purposes of example,
and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of
the description, the techniques described herein are applicable
beyond LTE, LTE-A, LTE-A Pro, or NR applications.
A macro cell generally covers a relatively large geographic area
(e.g., several kilometers in radius) and may allow unrestricted
access by UEs 115 with service subscriptions with the network
provider. A small cell may be associated with a lower-powered base
station 105, as compared with a macro cell, and a small cell may
operate in the same or different (e.g., licensed, unlicensed, etc.)
frequency bands as macro cells. Small cells may include pico cells,
femto cells, and micro cells according to various examples. A pico
cell, for example, may cover a small geographic area and may allow
unrestricted access by UEs 115 with service subscriptions with the
network provider. A femto cell may also cover a small geographic
area (e.g., a home) and may provide restricted access by UEs 115
having an association with the femto cell (e.g., UEs 115 in a
closed subscriber group (CSG), UEs 115 for users in the home, and
the like). An eNB for a macro cell may be referred to as a macro
eNB. An eNB for a small cell may be referred to as a small cell
eNB, a pico eNB, a femto eNB, or a home eNB. An eNB may support one
or multiple (e.g., two, three, four, and the like) cells, and may
also support communications using one or multiple component
carriers.
The wireless communications system 100 or systems described herein
may support synchronous or asynchronous operation. For synchronous
operation, the base stations 105 may have similar frame timing, and
transmissions from different base stations 105 may be approximately
aligned in time. For asynchronous operation, the base stations 105
may have different frame timing, and transmissions from different
base stations 105 may not be aligned in time. The techniques
described herein may be used for either synchronous or asynchronous
operations.
Information and signals described herein may be represented using
any of a variety of different technologies and techniques. For
example, data, instructions, commands, information, signals, bits,
symbols, and chips that may be referenced throughout the above
description may be represented by voltages, currents,
electromagnetic waves, magnetic fields or particles, optical fields
or particles, or any combination thereof.
The various illustrative blocks and modules described in connection
with the disclosure herein may be implemented or performed with a
general-purpose processor, a digital signal processor (DSP), an
application-specific integrated circuit (ASIC), a
field-programmable gate array (FPGA) or other programmable logic
device (PLD), discrete gate or transistor logic, discrete hardware
components, or any combination thereof designed to perform the
functions described herein. A general-purpose processor may be a
microprocessor, but in the alternative, the processor may be any
conventional processor, controller, microcontroller, or state
machine. A processor may also be implemented as a combination of
computing devices (e.g., a combination of a DSP and a
microprocessor, multiple microprocessors, one or more
microprocessors in conjunction with a DSP core, or any other such
configuration).
The functions described herein may be implemented in hardware,
software executed by a processor, firmware, or any combination
thereof. If implemented in software executed by a processor, the
functions may be stored on or transmitted over as one or more
instructions or code on a computer-readable medium. Other examples
and implementations are within the scope of the disclosure and
appended claims. For example, due to the nature of software,
functions described above can be implemented using software
executed by a processor, hardware, firmware, hardwiring, or
combinations of any of these. Features implementing functions may
also be physically located at various positions, including being
distributed such that portions of functions are implemented at
different physical locations.
Computer-readable media includes both non-transitory computer
storage media and communication media including any medium that
facilitates transfer of a computer program from one place to
another. A non-transitory storage medium may be any available
medium that can be accessed by a general purpose or special purpose
computer. By way of example, and not limitation, non-transitory
computer-readable media can comprise RAM, ROM, electrically
erasable programmable read only memory (EEPROM), compact disk (CD)
ROM or other optical disk storage, magnetic disk storage or other
magnetic storage devices, or any other non-transitory medium that
can be used to carry or store desired program code means in the
form of instructions or data structures and that can be accessed by
a general-purpose or special-purpose computer, or a general-purpose
or special-purpose processor. Also, any connection is properly
termed a computer-readable medium. For example, if the software is
transmitted from a website, server, or other remote source using a
coaxial cable, fiber optic cable, twisted pair, digital subscriber
line (DSL), or wireless technologies such as infrared, radio, and
microwave, then the coaxial cable, fiber optic cable, twisted pair,
DSL, or wireless technologies such as infrared, radio, and
microwave are included in the definition of medium. Disk and disc,
as used herein, include CD, laser disc, optical disc, digital
versatile disc (DVD), floppy disk and Blu-ray disc where disks
usually reproduce data magnetically, while discs reproduce data
optically with lasers. Combinations of the above are also included
within the scope of computer-readable media.
As used herein, including in the claims, "or" as used in a list of
items (e.g., a list of items prefaced by a phrase such as "at least
one of" or "one or more of") indicates an inclusive list such that,
for example, a list of at least one of A, B, or C means A or B or C
or AB or AC or BC or ABC (i.e., A and B and C). Also, as used
herein, the phrase "based on" shall not be construed as a reference
to a closed set of conditions. For example, an exemplary step that
is described as "based on condition A" may be based on both a
condition A and a condition B without departing from the scope of
the present disclosure. In other words, as used herein, the phrase
"based on" shall be construed in the same manner as the phrase
"based at least in part on."
In the appended figures, similar components or features may have
the same reference label. Further, various components of the same
type may be distinguished by following the reference label by a
dash and a second label that distinguishes among the similar
components. If just the first reference label is used in the
specification, the description is applicable to any one of the
similar components having the same first reference label
irrespective of the second reference label, or other subsequent
reference label.
The description set forth herein, in connection with the appended
drawings, describes example configurations and does not represent
all the examples that may be implemented or that are within the
scope of the claims. The term "exemplary" used herein means
"serving as an example, instance, or illustration," and not
"preferred" or "advantageous over other examples." The detailed
description includes specific details for the purpose of providing
an understanding of the described techniques. These techniques,
however, may be practiced without these specific details. In some
instances, well-known structures and devices are shown in block
diagram form in order to avoid obscuring the concepts of the
described examples.
The description herein is provided to enable a person skilled in
the art to make or use the disclosure. Various modifications to the
disclosure will be readily apparent to those skilled in the art,
and the generic principles defined herein may be applied to other
variations without departing from the scope of the disclosure.
Thus, the disclosure is not limited to the examples and designs
described herein, but is to be accorded the broadest scope
consistent with the principles and novel features disclosed
herein.
* * * * *
References